It’s only too small for the position if they don’t know how to play post. Broad shoulder and big rear guys like either of them should be able to root around and put the defender on one side of their body or the other. It seems to me that if Broome could be a Wooden Finalist center at Auburn, then 6’ 8” is plenty big for power forwards.
Whoever taught Grant Williams or Ron Slay needs to come back to teach Brown and Carey how to play like an old school power forward. It’s either that, or Brown needs to fully immerse himself in learning to dribble and shoot outside. Carey is PF or bust. Carey would be the next Zion Williamson if he had the quickness to play SF, but he doesn’t have it. maybe lose 20 and get a verticle