that happens to every gm in the history of sports. Because eventually every gm is going to make some bad signing/draft/trade because sports has a lot of dumb luck involved and tons of things a gm has no control over. And when it happens the fans say the gm is bad even though he is the exact same guy. At least with cup winners you know they know what winning hockey looks like. Right now there are gms who's fans are happy but its only because he found some dumb luck in the draft or whatever and it's really anyone's guess if that guy knows what winning hockey looks like or how to build it
In a sense, yes, that's what happens. But there were some egregious moves made by JR before the cups that were helpful to what the Penguins were trending back towards and then after he made moves that helped the Penguins effectively close their window a lot for whatever contender status they had left at that point. They became a bubble team that lost a lot of what made them back 2 back champs.
The funny thing is when outsiders come and tell you what's what when we're discussing it on a day to day basis, there's the outside perspective from someone that follows the team but isn't a fan, but someone that recently takes on an ex-gm of a team, will have this need to just focus on the success and blame the bad stuff on "well that's just a little bit of the bad that comes with the job!"
No, he destroyed the Penguins prospect pool that was already middle of the pack before he got there, maybe even lower, usually contenders are in the bottom of the prospect pool because they moved a lot of picks, but they trend back up eventually, Penguins continued to trend down and kept getting further out of the contender status range. JR had a lot to do with that. So why is it possible for him to be 100% responsible for the cups, but not 100% responsible for the last 4 years where the Penguins became a massive hot mess?
The last good things JR did was the Jarry contract and getting Kapanen back. That Zucker deal does not look good in the least bit though.
I still remember when Devils fans told us Shero will fix their team and win them a cup again, we all knew Shero's faults and had seen him long enough away from the Cup to know what he was also capable of. Usually what a Gm has done last, is what you'll get. What JR did the last 4yrs, is closer to what the JR you'll see in Vancouver.
Hiring yes men, being mad when power is taken away from him, etc.