Yea, Spurs don't have enough room for another max contract unless he's take a mad pay cut, which I hella doubt.
But even if he was willing to do that for championship contender, Spurs would probably find difficult to convince him to join us considering we don't have an athletic big man to run the floor & catch all these lobs, assuming Dedmon gets a big contract elsewhere.
I don't think you'd even need a lob catching big man to convince him to play on the Spurs, assuming he wants a ring far more than that big fat check he's going to get from the Clippers. He'd be a huge pick for the Spurs because they get an active playmaker that can help Aldridge and Leonard offensively.
Its just that the Spurs just have too many awkward contracts and pieces that the only way they're going to become true championship competitors quickly is if Anderson/Bertans/Murray develop quickly. After they deal with Duncan's contract, they have to deal with Ginobili's and Parker's contracts. Ginobili is probably gone at the end of this season but Parker is still going to be sticking around. You could try and "Toronto Hakeem" Parker for some draft picks but he isn't worth shit and its difficult to do him dirty considering he's played so many playoff minutes for the Spurs. Then you have both Gasol's and Aldridge's contracts, which are big for pretty difficult to trade pieces. Gasol is old and a complete defensive liability and I don't think Aldridge is an analytic showpiece for the Daryl Moreys in the league.
And then the Spurs have to decide if they want to keep guys like Patty Mills, essentially an undersized shooting guard, pretty soon...
Unfortunately, its a time all franchises go through after their core ages and disintegrate. I guess count your blessings that you weren't tied down by Kobe's contract and the Tank Commander.
One you forgot that is a perfect edge case is Joe Johnson. Numbers wise he's very close. The above link puts him just above a 50/50 shot. He and Manu are probably the most interesting edge cases. Manu doesn't really have anywhere close to the numbers.
Zero chance Manu isn't making the HoF. Ignoring the 4x NBA championships, dude has some pretty huge accomplishments in the Euroleague and also took down the USA in the 2004 Olympics.