Ignoring quinn, the draft part is still relevant for me because it highlights some intrinsic skillsets.
I thought cozens had hockey IQ issues before we even drafted him, so it's not simply a matter of hating on guys we pick (and I'll acknowledge this is my opinion, not universal truth). IMO it's his decision making that continues to ail him, and while the roster might not be giving him much help, he's sort of shown the same flaws for years which makes me think it's more than a roster issue.
A guy like Rossi isn't perfect. Smaller than cozens, not as fast, probably not as aggressive, but I think there's a chance that he could have a more positive impact on this team, because I think he's smarter. Again, his intelligence is a reputation preceding his draft. I think it could be an inherent strength which could be useful on this team. Of course, being on a better team with better linemates will help hide his weaknesses and highlight strengths, I just don't think thats the only explanation of the difference between the two players.