That is where, IMHO, you have missed it theologically -
First - Paul was NOT one of the twelve and yet laid hands on numerous people for the infilling of the Holy Spirit.
Second, the gift (or manifestations) of the Spirit, including the power gifts, are mean for the body of Christ ( the church) and is still so today, even though the 12 are long gone.
Third, Acts 8:12 But when they believed Philip as he preached the things concerning the kingdom of God and the name of Jesus Christ, both men and women were baptized. 13 Then Simon himself also believed; and when he was baptized he continued with Philip, and was amazed, seeing the miracles and signs which were done.
Why was Philip preaching the things concerning the kingdom of God and the Name of Jesus Christ. That is the work of an Apostle (sent one).
Philip was one of the twelve Apostles just like Peter and John.
Matt 10:110 And when He had called His twelve disciples to Him, He gave them power over unclean spirits, to cast them out, and to heal all kinds of sickness and all kinds of disease. 2 Now the names of the twelve apostles are these: first, Simon, who is called Peter, and Andrew his brother; James the son of Zebedee, and John his brother; 3 Philip and Bartholomew; Thomas and Matthew the tax collector; James the son of Alphaeus, and Lebbaeus, whose surname was Thaddaeus;