I think this drama around PK is actually getting to him a bit. He doesn't look anywheres near as confident. Especially on D. He looks sooo afraid to make a mistake.
The other thing I don't understand, If Therrien thinks Pk isn't good on the penalty kill, why isn't he giving him the opportunities on the ice to improve?!?!? He is young and has always been willing to learn and round out his game. PK is a franchise player and it's Therrien's job to help him improve his game, not accept his weaknesses and shelter him.