That's like asking why Luke Glendening doesn't have a better chance to be a top line forward than Anthony Mantha.
"But Glendening tries so hard, he trains so hard, he is so dedicated!" Yeah, and? He's smaller, less skilled, not as strong, doesn't have the vision, and doesn't have the shot that Mantha has, even when Mantha had engagement and effort level question marks, he has something that character can't create.
If we look at Rossi, I personally think he lags behind Raymond or Perfetti in terms of hockey sense/IQ, his shot is lesser, his vision and playmaking is lesser, his skating is not markedly better or worse (depends on how you feel personally).
What you are banking on is that his two way or grinder mindset carries him, but I don't want a grinder mindset to be the differentiating quality in the top 4. Especially when someone that I have ranked higher, Perfetti, who doesn't carry character question marks like Merkley did when SJ drafted him, is available and carries the more important qualities that I am seeking.