Yeah I think that's clearly exaggeration. But definitely the premium positions are 1C and 1D ... if I have a guy with that sort of potential I don't let him go for anything less than an established superstar in his prime. It's why you would probably never trade Seider for a young W either, even if talent level were close or maybe even slightly in favor of the winger. 1D is simply more valuable.
Put it this way ... if both teams offered Raymond or Carlsson for, say, a high pick in this or another draft, which guy do you think most teams would take? I don't think it'd be 100% either guy, but I sure think more teams would go Carlsson than Raymond.
2 years is not insignificant for development at that age. Actually chronologically they're closer to 3 years apart, no? So can Carlsson surpass that by his D+4 year? I have no idea, but would you be completely stunned if he did?
As a tangent one thing Killorn mentioned this season, when Leo got hurt this year the doctors checking him out found that he hasn't finished growing yet. They think he has a few more inches left in him. He's far from finished developing even physically, never mind developing his game too.
To be fair anyone can stall or even regress in development. I mean, who knew that when Jimmy Carson had 141 goals before he turned 21, that he wouldn't score that many goals for the remainder of his career?