The league has changed a lot and the San Antonio Spurs could change with it, going with non-traditional line-up. Size isn’t as nearly as important as it once was, speed and shooting have taken priority. This is something that Rudy Gay can provide at the four-spot for the Spurs. This is a move that could increase their scoring and likely still retain their rebounding numbers. Gay has the height and length to grab rebounds at a solid rate.
The Spurs have traditionally went with a more defensive minded guard at the two-spot, but Gay’s offense may trump that strategy. It will be interesting to see if he still has the quickness for this position, and it is no guarantee this move would work as a long term solution. Still, anything would be an upgrade over Danny Green in terms of offense. The Spurs system doesn't put a lot of pressure on this position, even Tony Parker and Patty Mills have seen time here and there.
1) Sixth Man:
This may work best for the scorer and allow him the room to grow in the Spurs’ system. In the starting line-up he would have to play second fiddle to Kawhi, while off the bench he could easily be the focal point of the offense.This could also ensure that he stays healthy, shying away from starter minutes. Rudy Gay wherever he plays will be a huge asset for the Spurs offensively.