I don't think contextual factors are fleshed out enough to be useful right now. There's so much that can affect how a player handles a role that isn't captured by numbers such as QoC and ZS%.
Fowler hasn't been the best performer in his current role. I'd be surprised if that didn't change if moved though. He reminds me of Gardiner in many ways, guys that use their skating to find pucks and move them up the ice, and that are not really the offensive D-man they often get labeled as. And like Gardiner I think he shouldn't be out there against every type and level of opposition.
How are polak's advanced Stats? Going to go out on a limb and say they suck, mostly because he sucks. Yet here we are and Polak is back advanced stats are not as high on the priority list as you think or Polak wouldn't be here and Martin probably wouldn't be either.
Martin has strong stats where it matters to him in his role.
Polak has great stats on the PK, which would be a large part of his role.
Probably. There is no way Lindholm's CF% is going to drop by 9%, (1st to 21st). Usage really isn't an excuse unless you are a defensive forward who is getting absolutely shafted with defensive zone starts. There's only 6 defensemen playing at anytime, so their zone starts are rarely that extreme. Fowler's usage is not abnormal at all.
Yeah, I've found that when you deal with ZS%, you don't see much effect at all until you deal with the very extremes. QoC barely makes a blip. QoT does more simply because the differences are more profound between players there.
I'm not sure whether this isn't more that the stats themselves are faulty, than that contextual factors don't matter.