I think there is a lot to bite off here, you are trying to make it way too simplistic, when it is not that at all. There is a reason these skilled 6'6" guys are as you called it unicorns. To have the hands, and everything else is just nearly impossible. They have their own challenges, and maybe there is a bigger reason we see less, make it as far as brown. Either way, I can't count the very many top centers the league has ever had being over 6'5" (fully admit weird cut off at the inch different point).
Just as there are way more small skilled guys, how many become top 10 talents for the draft? It is just as hard for them. Both sides are outliers, I don't see how that is a hard concept. I am not advocating here what is better. Just that both too big or too small have equally hard times ahead.
Same as above too simplistic. Could Lindross have played the same style of game at 5'10"? Maybe he playes a different game, is a smarter player and doesn't get caught by stevens... again and again.
I mean obviously if they are the exact same skill level take the bigger guy, but I don't think that has really ever happened in this sense. I could just as easily say do want Johnny Hockey or Boyle? Kane or Bjustad, but I won't cause I know it is meaningless.
Do you not agree both players will have their own difficulties moving up when they reach the NHL?