The issue is that Kreider's drop has been so massive that you can't just chalk it up due to the team. Like I said, the dude has 3 5v5 points in 31 games this year.
Nor can it be chalked up to being 33. Like I said, that kind of drop doesn't just happen. There are reasons for it. Something being rotten in New York is pretty undeniable and clearly playing a factor. What else might be going on, I don't really know because I don't follow the Rangers like that. Maybe he's hurt. Maybe he's feuding with Lavy. Maybe he's pouting because of the losing and trading away players. Maybe it's some bad luck. Maybe his dog died. I don't know. But if the analysis is just "L.O.L. he has 3 5v5 points this year", then there's not a conversation to be had here.
Something else to consider, much like Kunitz actually, Kreider is a career 55 point / 82 game player. He put up 75 points last year because he had the highest oiSH% of his career, had his 3rd highest personal shooting percentage (2nd if you only count full-ish seasons), and about a minute and half more ice time per game. So some regression to the mean could be expected, but the pendulum has swung in the opposite direction with shooting percentage 2.2% lower than his career average, his oiSH% the 3rd lowest of his career (in full-ish seasons), and his ice time back closer to his career average. Unless he's hurt, I'd bet on a progression to the mean at some point.
Beyond that, I think Kreider fits stylistically what the Pens need more of up front, i.e. size, physicality, defensive awareness, and finish. For all of those reasons, I think he'd be great with Malkin who is still creating, but not finishing like he used to.
Is it a 'risk'? I guess, but we're talking about getting him pretty cheap so the only downside is you wasted a 2nd pick or whatever and have a bad contract for a couple of seasons that probably aren't going to matter anyway. Like I said in my initial post, if you know he's hurt, I'd pass because because that changes the calculus on him rebounding and just how bad of a contract it could be. Otherwise, I think it'd be a risk worth taking.
But I can't imagine the Rangers trading one of their long time, homegrown players to one of their divisional rivals, so this was all probably a waste of time.