He may disagree with you. I haven't seen him play, but size does not seem to be an issue in today's landscape.
Name Alex DeBrincat
Height 5.07
Weight 160
Season Team GP G A PTS +/- PIM
2015-16 Regular Season Erie Otters 11 14 7 21 4 2
I wasn't aware DeBrincat had been drafted to an NHL team, let alone played in an NHL game.
There are better examples w/ the usual suspects:
Johnny Gaudreau -> played in college
Marty St. Louis -> played in college
Pat Kane -> played in the CHL
Tyler Johnson -> played in the CHL
David Desharnais -> played in the CHL
Paul Kariya -> played in college
With this particular situation, there are examples within the Leafs organization. Off the top of my head:
Tyler Biggs -> played in college, left after a year -> played in the CHL -> now is set to make his season debut in the AHL after being a healthy scratch all season (draft +4)
Jerry D'amigo -> played in college, left after a year -> (sent) to the CHL -> now playing in the A (draft +6)
JJ Piccinich -> played in college, left after a year -> playing in CHL -> outlook TBD
I don't recall any of those 3 having size issues (for lack of a better word) in their draft.