Fair enough. I'd generally agree with two instead of one, but not when it's a clear cut top 10 player. That's more important than anything.
Besides, veteran ring chasers are more likely to accept the minimum for a chance to play with Leonard and Paul and there's some options at 29 that could serve as the rim rolling lob threat (including Bell, who could be a plug-and-play option).
I actually think, despite Paul helping to negotiate the new rules that benefit him, he'd consider giving up the 5th year to join the Spurs. The primary reason I don't see him coming is, it would be extremely difficult for the Spurs to carve out max cap space. Gasol is the obvious one, but one of Aldridge or Parker would have to go as well. The former, despite his down season, would still likely be a selling point in the recruitment and the latter, they'd have to be willing to end his tenure (I don't believe they'd do this and considering Paul is good friends with him, I doubt he'd do this) and attact a future protected 1st to salary dump him.