I don't think it's a total loss. All players seem to have an adjustment time for the game to slow down for them. I think we are seeing the game just slow down for Cedi. I don't think it has slowed down for Sexton yet. Just getting those games under his belt will help him.
Also Delly has been working with him and getting Delly at least gives Sexton someone to work with. At least Koby figured out that the coaching staff wasn't going to cut it.
I'm hoping the game will slow down for him by the end of the season so he can make the most of his summer to add to his game.