the need for a PF to shoot 3s is pretty much overstated imo.
#1, Spurs had PFs to shoot 3s in the years past (Ferry, even Lohaus). They weren't the difference maker, guys who could penetrate and create shots were like Manu and Parker.
#2, I think people are too readily confusing Horry the player with the idea of the PF position. You can get PFs who shoot 3s on the cheap. Austin Croshere. Keith Van Horn. Cliff Robinson. Sean Marks was good out to a long two-pointer easily, and he was a vet-minimum guy. , if the Spurs wanted, they could have drafted Nick Fazekas and had him for cheap.
#3, as a result, just because Bonner can shoot 3s, doesn't make him a legit Horry replacement. Bonner will never get 5 blocks in a finals game. Bonner will never grab 9 rebounds in the first half of a finals game. Bonner will never be dependable to force multiple turnovers on inbounds passes with his crafty plays.
The only thing Bonner does even close to Horry is shoot from long range, and he's never done that in the clutch, ever.
Signing him to a contract nearly identical to the one Scola was asking for last summer is highly dubious.