To begin with, Bosworth's tract is found in it's entirety at:
http://www.isom.vnsalvation.com/Resources%20English/Christian%20Ebooks/FF%20Bosworth%20Do%20All%20Speak%20With%20Tongues.pdf
It's a good read, and presents many of the standard cessationist arguments - with the "Slant" of one who has been baptized in the SPirit speaks in tongues, and accepts "tongues" as a legitimate Spiritual enablement.
Bosworth's belief (and the reason that he withdrew from the AG early on) was his disagreement with the establishment of an "Official dogma" - (Fundamental truth #8 - doctrine of Initial Evidence) - making "tongues" the ONLY OFFICIAL INITIAL EVIDENCE.
"Baptism in the Holy Spirit" (Fundamental truth #7) IS a "Core/Cardinal Doctrine" of the denomination - one of 4.
Bosworth (when you read the "tract") Spoke in tongues at will himself in what we'd call "Prayer in the Spirit" mode, and he led many people into the Baptism of the Holy Spirit, many of whom ALSO received the gift of speaking in tongues at the time. HE has no problem with that either before OR After his parting of the ways with the AG.
Bosworth's PROBLEM with the AG was that he DID NOT believe that the Bible supports a HARD DOCTRINE that "Speaking in tongues" was
THE ONLY EVIDENCE that provided "proof" that the individual had ACTUALLY received the "Enduement of Power" promised by Jesus.
SO:
"Do all have gifts of healings? Do all speak with tongues? Do all interpret? (1Co 12:30 NKJ)"
ANd the obvious implied answer here is NO.
"I can't find any direct rebuttal of this Pentecostal minister's insistence not all speak in tongues."
The AG.org site does make mention of Bosworth (and Donald Gee) particularly in the section:
The Full Consummation Of The Baptism In The Holy Spirit Bosworth is spoken highly of as a person of integrity and character - that the AG considers to be in error.
"Also I'd like the BEST AOG rebuttal of those who say this teaches not all speak in tongues."
The article above is probably the best "Official word" on the subject.
"Which by the way, says only 3.8% (120) of the 3,120 saved that day [100*(120/3120)], spoke in tongues. A definite minority. (And that was the Time of the gifts maximum manifestation in the church!)"
Of course I shouldn't have to point out that you've made a classical "argument from silence". It IS TRUE that the Bible DOES NOT SAY anything whatsoever about ANY of the 3000 "Speaking in tongues". But it's a good idea NOT to form a doctrine on basis of what the Bible DOESN'T say.
"the majority in Corinth wanted to forbid them"
An Assumption on your part. Apparently a significant number of Corinthians were "Showing off their gift", and enjoying it.
"But happily they didn't have to, tongues ceased soon after this, never mentioned again in the NT. In fact, by 66 AD all signs and wonders were spoken of in the "past tense"
Really - Galatians speaks of "The one who DOES Miracles among you" in 53-57. I wouldn't argue that in the years following the "Apostolic age as the Visible Church descended into superstition ignorance and confusion, there's only sketchy evidence of the "Gifts" until the 19th century.
"I want to focus on Pentecostal minister Bosworth's argument that not all speak in tongues. Let's treat that first and exclusively."
Sure, but
since I'm in agreement with Bosworth in his PRIMARY argument - i.e. that "Tongues" is not the ONLY "initial evidence", I'm not going to be that one that "Opposes him" strongly.
My 50 year association with the AG has produced several personal observations:
There are people who have NEVER spoken in tongues, but who exhibit the "Fruit of the Spirit", and communicate Spiritual things, and understandings in a unmistakably Christ-Like way.
There are folks who "Speak in Tongues" and who are mean, judgmental, and show NO overt Christian attributes whatsoever.
AND there are folks who "Speak in tongues", life Exemplary lives, flow in the love of Jesus, and minister with signs following.
"Speaking in tongues", "Interpretation", and "Prophetic utterance" can ALL be faked with a little practice (Back in the day the "Way International" for $300 would teach you how to do it). I could EASILY STAND in a Pentecostal service, and rip off a totally convincing "Message in tongues", AND an "Interpretation" that would fool anybody that wasn't operating in the gift of "Discernation of Spirits". It happens.
The LAST time I was prayed for (In an FGBMFI breakfast meeting in '73) to receive the baptism in the Holy Spirit - NOTHING OVERT HAPPENED. About two weeks later I began speaking in tongues in the middle of a worship service (again at the FGBMFI at a dinner meeting). It was a totally non-emotional experience.
Before they WEREN'T there, and after they WERE, and 40 years later they still are. This would be Donald Gee's "Delayed evidence" teaching that the AG isn't too fond of.
Among a growing percentage charismatics World Wide, "Tongues" is considered to be AN "evidence", but so are other spiritual manifestations as well which would jive nicely with Bosworth's teaching.
In my case there WAS a "Satisfaction" connected with actually "Speaking in a tongue" (no more "Head rubbing sessions" among well-meaning, but ineffective Pentecostals).
But the REAL evidence that "Something had radically changed", was that within a month, I was given (by God) a Bible study to teach, and I did so for the next 5 years, or so - among a group of UCC folks, and The Holy Spirit kept me "Loaded for bear" - ALL OF WHICH would have been
completely IMPOSSIBLE for me to have done before (because of my shyness, and "Fear of the face of man"). There had been an obvious "Enduement of power", which has extended to many other aspects of life.
And, of course I HAVE been burdened by the Holy Spirit to Interpret tongues many times, and occasionally to give Prophetic utterance.
But NEVER to "Speak in tongues" in "Message to the congregation mode". SO in THAT sense - I don't "Speak in tongues" - even though I do constantly in private.
BUT - in 2014, in the U.S. the "Normative experience" among Pentecostals/Charismatics is that WHEN they are baptized in the Spirit, they will speak in tongues.
Some years back, Thomas Trask (General Superintendent of the AG) made the statement: "If the Present trend continues in our churches, within a decade we will be Pentecostal in NAME ONLY". The trend has continued, and in AG Churches in the Dallas area, it's exceedingly RARE to actually hear a "Message in a tongue", or an "Interpretation" during a service - Our plant manager attends at one of the largest AG churches in the area, and after 6 months he didn't KNOW it was a "Pentecostal church", or that it was an AG franchise.
We're not sure why -
Simple as that.