In one sense I would have to agree with you. Looking at AS's loses minus the DQ, 2 out of 3 he was subbed. And than in a more recent fight with Leites, he wanted no part of the ground game with him (I do understand that AS was also fighting the smart fight, it makes more sense to fight to your strengths) If his bjj is that good, why not showcase it more often?
On the other hand, when a sub specialist like Jacare gives you that kind of praise, it speaks volumes. IMO we will never know, because in his next 3 fights, supposedly his last 3, I really don't see anyone going to the ground with him. (That's assuming he fights Belfort, Nate and Hendo (if he resigns with the UFC)).