Bradley is not to blame.
This one is on Coach Stevens.
Why didn't we double team or foul Greg Monroe?
This^^
When it became apparent that Celtic bigs we're helpless defending Monroe, we needed to foul or double team him...or at least call time outs to stop the flow of his onslaught. Coach needed to see this.
The Celtics lack of a good defensive center was painfully apparent, Sully was too slow, and lacking height to bother Monroe.
KO is bad enough against stationary type of slow coverage, but when ask to move his feet, he's cooked.
Zeller is too soft, he doesn't take on personal challenges well at all. He's a back up.
The Celtics need a center that can defend his position.