Kawhi/Danny's defense is marginalized against the Clippers b/c they run their guards through millions of screens. On the other hand, they get to play 1-on-1 defense against Durant/Westbrook without worrying about Tony chasing Re (Ibaka is a spot up shooter & can't take advantage of mismatches

).
Roberson also isn't as good a defender as a Moute & if they choose to play Waiters instead Durant has to guard Kawhi. Patty also doesn't have to worry about getting bullied by Rivers.
People are forgetting how the Spurs thoroughly outplayed OKC at home during the 2014 series even w/ Ibaka in the lineup (Gm 5) meanwhile the Clippers are the last team to win in San Antonio both in the regular season & playoffs. As long as they have home-court advantage (ThunderRefs

) & Harden doesn't get traded back to OKC

, the Spurs should be good.