the kid is definitely a player,have you watched powells tapes 21 pts 17 rebounds but even better somewhere there was tape of him playing d-one on one top of the key,this guy tried everything but powell had perfect sliding stance, quick lateral motion and beat him to spot side to side for like 10 seconds-a joy to watch a big play d like a guard-i know this is d league but he gets to the hoop off dribble and with reverse quickly and to watch him rebound and just dribble out like a guard or beat the opposition center down court for dunk-also was impressed with his touch and economy of movement.He doesn;t always dunk just lays off glass,there was a slashing move to hoop and dunk over somebody at a crazy angle-just showed his athleticism---
When Powell first went to Maine, there was talk about them trying to mold him into a small forward. As you said, he hasn't been playing the up 3 there but rather the 5.
The skills and attributes you describe would work well at small forward, especially on D with the length and good footwork to help him effectively play man, and the smarts to go along with that to play team.