My solution is to keep Pionk on the power play as long as he is producing. And frankly, I don't care about Shattenkirk. He's most likely better than Pionk on the PP, but it is obvious he has regressed. So who really knows? And even if Shattenkirk is better, wouldn't you rather keep Pionk on the top PP unit for development and confidence reasons? I'm not pro-tank, but this is still an experimental year.
As far as 5v5 goes, Pionk needs to get off the top pairing. He needs to play less minutes. He needs to be tried with a different partner. And he needs to be coached. Like someone said, his defense isn't bad. It's pretty decent for an offensive defenseman. But he really needs to work on his zone exits. I don't get it. He can pass the puck well and skate like the wind. How hard can zone exits be? It gets annoying watching him hemmed in his own zone for so long, when you know he can be very effective at the other end of the ice. He needs to pass the puck out instead of just banking it off the boards. However, in the past couple games, I have seen some improvement from him in exiting the zone. Now he needs to work on keeping the puck in the offensive zone.
He still can improve, and I don't know why it seems many members are writing him off.