I should clarify that I don't think the temple incident was a "cleansing;" I just use the term because it's the popularly used term. I think it was a prophetic sign-act of judgement on the temple, in much the same manner that Isaiah, Jeremiah and Ezekiel acted out their prophecies.
In any case, it looks to me like the temple episode in the beginning of John and the end of the synoptics are describing the same incident. So I think there was only one. It looks to me as if you think there were two incidents at the temple - one at the beginning of his career and one at the end. Though you may label them differently, for whatever reason, it seems you have to say he did the same activity in the temple twice. I just don't see a good reason to think this is the case and see reason to think there was one temple incident, that it was at the end of his career, and that therefore John didn't arrange his material chronologically.