Thats really your argument?
there are many arguments and factors.
being a #1 pick doesnt make you have more potential then any other player not picked #1
Galchenyuk was #3 over all in a year where he missed all but 17 games in junior cuz he tore ligaments in his knee.
he came back and still scored 27 points in 48 games in his rookie year. His growth was def stunted and coudl propbably say he wasnt himself for at least 18 months. but produced. broke his hand too and missed two months.
he never avraged 16min per game in his first 4 year. his linemates were primarily, Eller, Prust, Desharnais and plekanec. Only towards the end of last year did he see PAcioretty and Gallagher full time for the last 29 games. he has been a PPG since December of last year. he is also only 22.
mckinnon blew out of the cannon in his rookie year and dominated. was incredible.
since has regressed slight and has yet to find that first year level. i remember the first year he was in the playoffs i was on the edge of my seat.
he does average over 18:40 per game which is almost 3 minutes more then Galchenyuk.
but he does produce and is exceptional. I just think the majority of the people's concensus is not based on actually watching either or both players play enough.