I saw the photo... the "guy" was Congressman Albert Thomas, from Houston and he was a better friend of Kennedy than of Johnson. Thomas was old (he was a WWI vet) and had wanted to retire in 1962 and Kennedy talked him out of retirement to make sure the Democrats held that seat. As to the photo, is he winking? I can't tell ... his face is mostly out of focus. And is LBJ even looking at him, or was he looking at Lady Bird? I don't know that either.
And what if it were a wink --- what the hell does that mean? Considering the man had just taken the oath of office as the President of the United States under horrible circumstances, how would one at least acknowledge that fact? Seems cheers and high-fives would be out of place and the cabin of that 707 was a little tight for formal reception lines.
This conspiracy stuff drives me nuts and with the internet today, it only took me 30 seconds to look it up yet there are kook web sites out there who do identify the guy as Carl Albert. Like all conspiracy crap, they are long on innuendo and short on facts.
I looked it up and saw it, as well. It seems to me that he is winking, and you can tell that LBJ is smiling (even though you can't see the front of his face, you can tell that he is smiling because of the way the side of his face look, if that makes sense). What does it prove? Nothing, really. Nothing at all. Yes, "high fives" would be out of place, for sure.
As for conspiracies in general, I find many to be unconvincing but all are fascinating. But if you are taking the position that all are "crap," I believe you are wrong. I believe in a bare few of them, and a plot to kill JFK is one, for sure. Cuban exiles and Mafia types, in particular, had good reason to participate in the plot to kill JFK.