Dang what is up with Isaiah today..
Like the rest of the team, he's overmatched.
IT is the clear number one option for this Celtics team, and the Cavs are keying on him to prevent him from scoring. He's a good player, but he's not so good that he can keep scoring when the other team is focused on stopping him.
IT also has trouble dealing with size and length. Surprise surprise given his height.