One thing that truly makes the Spurs great is this weird fact: It is difficult to point to any one player and say, "that's the key to the whole thing". When we do say such a thing, we usually point to Tim Duncan, or Tony Parker, or sometimes Manu Ginobili. Truth is, any given night, it truly could be anybody, and that's kind of the magic. It's nearly impossible to pick just one guy.
However, for this team this year, I think the MVP of the team is Patty Mills. This guy has gone from a end of the bench PG to become the team's ignition key. He lead the team in morale from the bench last year with towel waving and this year he leads morale from the floor with ridiculous, fearless shooting, relentless defense, and unending energy. That might be enough to suggest Mills as a MVP for the team, at least get his name on the ballot. But what puts him at the top of the ballot is how he does this unexpected amazing stuff while filling a role that's been remarkably vacant throughout the entire Tim Duncan era of the Spurs. He's a real, live backup PG. Fans no longer have to cringe every time Tony Parker has to go to the bench.
There are extremely good arguments that the '13-14 team MVP should be Tim, Tony or Manu, as usual. There is a tremendous argument that Kawhi Leonard is the guy. Compelling arguments can be made for Diaw, Green and Splitter as well. But the "Big 3" are the "Big 3". They are supposed to be great. And the other guys are all the starters at least part of the time. They are expected to be the ones carrying the team. Mills is just special because he's so unexpected, such a breath of fresh air on this team. And because we all basically gave up on there ever being a backup PG that we could tolerate coming off the bench behind Tony Parker, and this guy may have restored some hope for all of us Spurs fans.