The point of the IPP and individual shot attempt generation is to try and catch other instances where guys may be involved in shot generation (i.e., through passing). It's my theory that Erik Karlsson's shouldering an ungodly load (which manifests in the raw shot attempts), and to the extent that he's not getting shots off, he's passing to immediately get shots off.
This all makes sense -- we see Karlsson dominate games, we see him dominate control of play in the OZ, we see him rack up a ton of points. The problem I think is that he's almost too responsible for shot generation. Defenders take an absurd portion of low percentage shots due to the nature of their position; a heat map for Karlsson sort of exhibits that's the case.
A lot of people point to the disparity in Ottawa's elite Corsi% w/ Karlsson on the ice and average Goal% w/ Karlsson on the ice and attribute it to his 'defensive woes', which I'm not sure is entirely the case. It's possibly playing a role. But there's also part of me that sees that 'Defenseman Taking Massive Number of Shots in OZ' would probably artificially deflate on-ice shooting percentages in Ottawa's favor. (
http://stats.hockeyanalysis.com/rat...&teamid=21&type=goals&sort=ShPct&sortdir=DESC kind of lends credence to that theory).
So, to answer your question: I'm not really venturing into on-ice v. off-ice stuff.
I'm kind of more wondering why Karlsson's on-ice numbers don't see more favorable goal percentages, despite the fact that we know he's an elite possession driver by every stretch of the definition. And it's obviously not tied into qual teammate -- he generally plays with top lines, year after year.
What I think happens is Karlsson's boosting his line's Corsi% through more OZ time, but the team's experiencing a bit of a shot quality drag because of it. Which isn't necessarily a bad thing -- so long as you have a five-man unit that can keep pucks out of their own net on the transition back. That, of course, has been a problem.