I'm guessing that doc Rivers giving him a pat on the back had a little to do with starting to try to get him in a green jersey
by the time PP is ready to hang up the sneakers. He's starting to be able to do some of the things Pierce does, and it's not hard to fathom that his defense will come around.
So - maybe teams like the Raptors
just end up being part of a farm system of sorts. It's starting to look that way more and more. Hopefully the trend turns around.