Mitchell 100% spoke to Tosaw. I've had conversations with Bill about his experience with "Mr. Tosaw" (as Bill calls him).
I've spoken to Bill recently about another issue, mainly about the obnoxious drunk. He said that it was an "elderly man" sitting in front of him. The only elderly person on the flight was Robert Gregory, who would have been sitting back there. I sent him photos of Gregory and Labissoniere (my candidate for the drunk) and he says he really can't recall the actual face. He remembers the drunk making the FBI agent on the bus doing the roll call laugh by asking "hey, how long is all this going to take, I've got to piss."
Gregory's description is pretty thorough, so I just don't think it's him. Lab's testimony, on the other hand, reads like a drunk man's recollection of the events on the plane. Cooper wearing a "blazer and sporty vest". What? Lab also refers to having to take numerous trips to the bathroom and had a DUI at one point. Plus his hair is all disheveled in the video of him coming in the airport and I think he even looks a little drunk.