Where is depth more critical?

The last time we left the San Antonio Spurs, they had answered one off season question, still had one unanswered and had created another question about the 2011-2012 roster. The question answered was how were they going to find more productivity out of the small forward position. Kawhi Leonard should help Spurs fans sleep better at night knowing Richard Jefferson isn't the only small forward on the line up. The team still could still use some help down low, especially if Antonio McDyess does indeed decide to retire. Currently, the Spurs have 15 guys under contract. Though Danny Green could be let go with minimal cap implications. So we're looking for help at the 4 and 5 spots on the floor. The Spurs presumably will only have the mid-level exception to go after one or two free agents. Before you ask, had the Spurs used the amnesty clause on Jefferson, it still wouldn't have gotten the Spurs under the cap. I think going after a big man is the best play here. As far as bi...