No. I think his jump shot can improve so he isn't at his limit yet. I would also say that he has been our best bench player. I also don't think you can expect bench players to be super consistent. NBA players hit shots in spurts - so with less time the numbers they put up will be inconsistent.
Leon Powe has been our best bench player closely followed if not tied by House. TA is a distant third.
Based off what, your personal preference? TA's the 2nd unit's best scorer, dribble penetrator, creator, and defender, at least if you go by what Doc and the statistics say. But what do they know?
I'm positive TA is going to get better than he's currently showing. His jumper still isn't where it should be, he's still regaining his health (from his recent ankle sprain--and the knee too), and Doc has yet to really figure out his place in the offense. And if we had an actual point guard on the 2nd unit, he might be able to actually settle into a real role. Doc's asking him to do a lot out there given House's deficiencies, and Tony's responding well, minus the last couple games which can be chalked up to coming back from an injury.
And if you what to make the go-to Posey comparison, note that Tony's averaging more points, steals and blocks than James did last season in about 5 minutes less per game. Other than personal preference/bias, I'm not really sure what anti-Tony crowd can point to...TA's played decent-to-good given the 2nd team's deficiencies, and he's only going to get better throughout the season as the 2nd team continues to build chemistry and TA continues to build strength and confidence.