He's never been good at it and I don't think its been happening any more often than it ever has. Its just compounded with him not being good at the things he used to be good at.
But lets say he doesn't fit what the coaches want to do (as you said) then wouldn't it make sense to replace him with a more capable body ASAP? That would be both of our other regular LHD or someone from outside of the organization. I don't know why you keep going to Zac Jones, he isn't the only option, especially if the FO nuts up and is willing to part with Lindgren before the season is out.
Anyway his biggest regression has come in his own end.
@Raspewtin nailed it, he's been getting killed in 1v1 battles in his own end - Nothing that happens above the DZ really has any impact on this outside of the frequency in which it has a chance to occur, but he shouldn't be losing the battles as often as he has been. I'm not sure what is going on with him there, but I don't like it and if they keep running him out there with this usage its going to bite them.