Now after watching tens of Randle videos, I am almost certain that he will get minimum mins as a SF, maybe none at all. Especially after his first few years because he will get heavier and heavier with time with that body type. No way he can play SF if he gains another 15-20 libs.
It's not necessarily his weight(what you call heavy). It's how fast he can move that weight, how fast he can change direction, mobility. And I don't see him being mobile enough to guard SFs. LeBron is heavy as ****, but he's even faster.
Drummond is super heavy, but equally quick on his feet.