Key in the Mavs series? He posted a below average PER for the series while being torched by Jose Calderon and Devin Harris, two PGs that couldn't shoot until Tony was in front of them. His only great game that series was game 7, and turns out both Tim and Manu happened to have a great game too. If not for Tiago and Manu, we don't move on. He was much more instrumental against Portland (vs Lollard, a complicated PG to stay in front of), OKC in the blowouts and he did a good job hiding on Chalmers in the Finals, IMO.
I'm with you though, I still think he can only go up this season, barring any more injuries, but I think the 12-13 Parker is long gone. Which is unfortunate, but realistically he got here because he's physically limited. He can still be useful for the Spurs though, because he commands attention.