I think some people here thinks he might have been riding off of having a teamate as good as Rossi to play with and that if he didn't have that good of a teamnate on his team his stats might not be as good.
It's definitely an argument I understand and will respect if people are turned off by him playing with such a powerhouse. I feel as though Rossi definitely left his mark more on the powerplay for him, but I do not still think it was all that much. By using the website
Pick224 - Hockey Prospect Stats - Player Pairings, and plugging in Jack Quinn, we can see that Rossi only had a first assist on 8 of his 52 goals, most of which were more than likely on the powerplay (I didn't check but that is when most of his playing time came with Rossi). So its not like Quinn was being spoonfed all of his goals by Marco Rossi. Mitch Hoelscher was actually the most common first assist for Quinn, as he had 14. If we move away from the stats and look at his actual play, you can see that, although he does receive a good feed from time to time, he does a very good job of using his elite stick handling to get himself open for a high danger shot. The video I linked below does a good job of really showing off how he is able to create a lot of good scoring chances using his stickhandling as well, specifically in the time frame of about 6:27 to 8:27. I really do not feel as though he produces just off of good feeds from his teammates. In my opinion, albeit hard to compare because they are in different leagues, he is much better at creating chances for himself than a guy like Holtz, who in my viewings always strikes me as more of a pure sniper who doesn't have too much else going on at the moment (which I fully expect to change if he follows a proper developmental curve).