They have that, in Anderson and Simmons. What they need is someone proven, with size and knockdown shooting ability. Granted, he looked finished last season, but still. He checks too many boxes for them not to express significant interest, I'd imagine and they can offer the best combination of potential playing time and chance at a championship.
He has little chance of cracking the Grizzlies rotation (Green, Lee and Allen are guaranteed rotation spots and Carter, Barnes and maybe even Adams will get a look before he does) and no chance of cracking the Thunder's rotation (Durant, Waiters and at least one of Morrow/Singler are guaranteed rotation spots, Westbrook could play some defensive SG and the other of Morrow/Singler and Roberson will get a look before he does).