As usual many good points.
Since you brought up Lettieri I thought it might be instructive to compare the college careers of both.
Vinnie played at Minnesota for four years. Year 1 he was 2-6-8. year 2 he was 9-3-12. Year 3 he was 7-19-26 in 38 games and the 6th leading scorer on the team. His senior year he was 19-18-37 and the third leading scorer on a very good Minnesota team. When a college player has a big senior year you always wonder how much of it is just an older player being better than younger players.
Barron was 5-13-18 last year being the 6th leading scorer on the team. This year through 23 games he is 12-15-27, ceding the team in scoring. He is tied for 18th in the entire NCAA in PPG, 21st in GPG and 46th in APG. Even more impressively he is 4th in the NCAA in scoring per game for players under 21 years old.
So Barron is way ahead of Vinnie for their college careers. I'm not sure Vinnie is a good comparison for Barron.
It definitely is true that "being very good at a lower level does not mean you definitely can play at a higher level." But at the same time being a very good player at age 20 -- as evidenced by not only his being the leading scorer on Cornell but ranking high across the entire NCAA and even higher among U21 players -- is an indication he is ready for the next level to see if he can become a good player.
It's not just his scoring. Anyone who has watched Cornell play this year can see that he has shown the toughness with his size, speed, stick handling, shooting and creativity to show he could be ready for the next step.
I keep going back to the Gordie Clark standard. you move up a level when you dominate at the level you are at. I think there is a good case to be made that Barron has achieved that dominance standard this year.
Other than a general statement of wanting him to stay in college for another year I have not yet heard anyone articulate what more he has to gain from staying. I am more than willing to listen to that case.
This is true in general, but not for Barron. Scoring a little over a point per game in college is not some dominant performance that leaves him with nothing to learn at that level. He is a good player, but hes not as good as Hags after his Junior year, yet the Rangers left him in college (or he chose, not sure) for a senior year.
Think of it this way: Vinni is a better AHLer than Barron as an NCAA player. Yet, Vinni cant make a jump to the NHL and needs to learn more in the minors. Being very good at a lower level does not mean you definitely can play at a higher level.
Most ppg NCAA players cant play on the top-9 in the AHL. Maybe Barron can, but it isn't a foregone conclusion just on his stats alone. I'd need to hear an argument for what makes him superior to all those ppg NCAA players who went on to play in the ECHL or stayed in college.
My gut says he stays in college one more season when he can hopefully be one of the better players in all college leagues.