Horford made a couple of bad plays down the stretch that cost us, sure, but he's been our best player this year.
It didnt help that Rozier was not in position to receive that pass, then Rozier didnt properly foul the guy with the ball on the next play, resulting in a 2 PT dunk by OKC. Bradley and Amir let Westbrook waltz to the hoop on the go-ahead basket. On top of it all, Brad Stevens kept the starters on the bench waaaaayyy to long in the 4th. He should have had them back in there much earlier.
This team is going through some growing pains, Rozier and Brown have been asked to play significant roles early on, and Smart is a key rotation guy. They are all too young and need to mesh better with Horford and Crowder and IT. It will take some time.