If it is a mind game it is not with Coach O, it is withthe LSU defense, especially the backs, who may prepare just a little less well, maybe subconsciously, if they think Tua wont play, or wont be that effective. Might also affect the offense a bit about how many points they need to put up to win. That said, in reality, I dont think it matters much. It is not like we shift the offense from pro set to wishbone depending on who is at quarterback.
Saban might just be telling, you know, the truth and at this stage he thinks he will not really know for certain till a week from Saturday. And it might keep him from having to face basically the same question asked five different ways at every press conference.