Celtics lost because they went stone cold shooting in the 2nd half. They got decent looks, looks they were getting in the 1st half, and simply went cold. It happens.
No problem with not calling a TO. They ran a set, got JT the ball. He got doubled. Ball went to JB. He created a high quality shot given the situation but missed. Heck, this shot was an easier shot than the three he hit to send it to OT. Misses for the win happen.
If the good look by JB goes down, no one is complaining about the lack of a TO.