O'Hare would be OK, but he doesn't strike me as being flamoyant enough (at least, he wasn't as Sinclair). If nothing else, Cain came across as flamboyant in LL.
We need an actor who can play someone as larger than life, the way Lloyd Bridges did. O'Hare's got a good look, but can he do that?
Patrick Stewart (if he wasn't so identified with ST:TNG) might be a good choice (he can be flamboyant). James Garner, Mandy Patinkin, (I'm just taking names off the top of my head here), even somebody like James Caan, although he might lack the physicality of a Lloyd Bridges.
How about one of the Bridges boys? I don't like either of them, but if they buffed up a little.....
I am
Dawg