How do you figure we're not the best situation for him basketball wise?
In another post you said that OKC has the better team, as proven by them beating us, but you forget he was the primary reason (other than their rebounding advantage) they beat us. We even held Westbrook to below 40% over the series. Him added to LMA and Kawhi is a far better 1-3 punch than him plus Westbrook and Ibaka/Adams/Kanter (take your pick on the Thunder's number 3). I really think this was the Thunder's "peak" season. I just don't see that roster, as it is, improving upon the performance they had this season. KD on the Spurs turns them into a superteam, especially if we figure out how to keep Danny.
I just don't see any better options basketball wise. Wall and Beal are way below LMA and Kawhi. Boston has a nice young team, but they're still a few years away from maturing. Not to mention their best player is a 5'9" PG. What Thomas did this season is likely unsustainable.
I see it being between OKC and the Spurs. He might feel loyalty and have faith that Adams and Roberson (two <25 year old players) can further improve going forward. But joining the Spurs does give him the greatest chance of winning a le in the next 3 seasons, since our core and coach are locked up.
I still see it as long shot, just because the Spurs landing the two biggest FAs in back-to-back seasons would be unprecedented, but there's a lot of logical reasons as to why it makes sense for KD, especially if he's desperate for a le. (Have to remember, he's 28. Clock is ticking).