Spurs stop OKC | Thinking Basketball
Basically, Wemby camps out on defense around the free throw line, which takes away SGA's favorite shot and the Thunder haven't found a consistent answer for it. Caruso ends up with as many wide open 3's as he wants and hasn't been able to punish them.
I don't think Giannis or AD would specifically help with this. They might need a dangerous 3-and-D guy instead, like Trey Murphy or even Kawhi (if Kawhi's contract makes sense for them and he's willing to fit in).