Already said it a few times in diff threads, but on that last meaningful play at least, there wasn't much time. OKC denied Leonard the ball, so Parker got a pretty good look at a shot he's made a living off of.
Considering Parker has been hitting shots the last few games, I don't think it's that bad. The only other thing that could've happened is once Lamarcus saw Kawhi couldn't get free, maybe back down Kanter instead of going out to the 3 point line, in no mans land. But he was so off that game, maybe he didn't want the shot.