After what I thought was a very strong start, Faulk has tailed off lately, and currently wouldn't be in the Pietrangelo class.
I assume for "46" you mean Krug. I actually like him better on the PP overall than Pietrangelo in terms of both passing and shooting. But Krug has missed a lot of games because of injury since he's been a Blue, and there's no comparison in terms of defense to Petro.
Bouwmeester certainly was steadier defensively than Parayko is now on a game-to-game basis, he seemed to make fewer mistakes. He wasn't an overly physical player either.
Leddy has been OK, but I really thought he'd have more of an impact than he's had.
And I do agree that Mikkola has taken steps forward.