Of course he doesn't. He's not only giving up size advantage, but Silva is strongest where Georges is weakest. Not to mention, there is millions of mislead fans who actually think when a larger fighter beats up a smaller fighter, it does wonders for their pound for pound ranking. Georges already took advantage of their ignorance when he tooled Penn in the rematch, so he knows what he'd be risking if he loses.
When asked if he sensed St-Pierre doesn’t want the fight, White said, “There’s no doubt about it. That’s a fact.”