Not to be an apologist but, I don't put this on Pop.
The Spurs just lacked size and athleticism to deal with the Thunder. In some ways this team is better suited to play GS than OKC. I give some credit to Donovan or someone on his bench, because they adjusted, went big, got Westbrick to somewhat slow down. Diaw, West and Mills where just over matched. Pop really didn't have a whole lot options.
Despite this, the series was a lot closer than it looked.
A couple of bounces/calls here are there and we are in game 7 sunday.