I don't think people realize how low down KO is on the totem pole.
Do you really expect him to just start playing around with the ball in isolation, or call for a screen, the way IT or Turner do?
He has to play like a big man and run our offense. Eventually he'll get his shot to show what he's got as a major piece, but today's not that day. It goes those two, Bradley, Crowder, Sully, Lee, Johnson, THEN Kelly. He's 8th in terms of the pecking order, maybe even lower than Marcus seeing as how he was picked 6th.
There's nothing AT ALL about KO's mentality that suggests he wouldn't be aggressive as hell and try to score 30 ppg if he was the leader on a team of younger players.
You don't have to look any further than Avery Bradley to find a kid who was an offensive liability and looked scared to have the ball when on a team with 4 hall of famers plus a top 3/mvp vote getting PG, who then grew up to be a great offensive player on a team where he's considered a leader and veteran (also the longest tenured Celtic).
Considering how much better KO has started out compared to Avery, I don't think you can be so closed-minded.