I get the "Ibaka" thing, but that is pretty weak IMO. If the Spurs weren't even contenders because of financial limitations, I can't see how Serge makes OKC enough to be front runners. Who cares if they are younger? It's a volatile situation with KD/WB under the surface. Not only that, what does Pau care about 5 years from now - he's not young. He shouldn't care that they are younger IMO.
If he's willing to take that level of money, I can't see how OKC is such a heavy favorite when SA wasn't even really considered unless the "asking price came way down".