Green and Kawhi are perfect fits for the Spurs, but the Spurs need an athletic combo guard to fill Manu's shoes as instant offense/6th man. That isn't the easiest thing to find.
Having a third post to take minutes from Duncan and keep him fresh. Blair and Diaw aren't it.
With a 4.9mm cap hold for Tiago [RFA] and a 1.1 cap hold for Neal [FRA], the Spurs sit at 45mm in salaries. Splitter will likely get 7-8mm/yr but they can use their cap space first.
Splitter
Duncan/Diaw/Bonner
Kawhi
Green/Neal/Patty
Parker/Nando
Ginobili is a FA and his caphold will be over 15mm, which would take the Spurs over the cap - to 60mm. If the Spurs can get Manu to sign for ~4mm, the Spurs would have somewhere between 8-10mm to work with for free agency. Giving Neal his walking papers would add another million.
So options:
6th Man Combo/PG/Wing:
Devin Harris as a 6th Man? He turns 31 next year. Not the most durable.
Jarrett Jack would be a solid 6th Man option.
OJ Mayo. I think he would not flourish so well under Pop.
Tony Allen. Probably wants a bigger deal than the Spurs would want to give, but would be nice to have a solid SF to backup Kawhi. Great defender, seems like a good person when he isn't going for an Oscar and would probably do well with only a corner three to worry about. Having Kawhi/Allen would be incredible for when we match up against Westy/Durant or Wade/James.
Nick Young: Some injury issues
Randy Foye - alwyas thought he was going to be better
Post:
Chris Kaman: Hurt all the time and sucks at D. But has some nice moves offensively under the basket. Kaman/Bonner front court would be horrifying.
Elton Brand. Spurs pushed hard for him a decade ago. Not much left in the tank, but could probably give a good 15 mpg.
JJ Hickson: Prob too expensive; 13/10 in 30mpg last year for Portland
Andrew Bynum: What can he get?