You don't get 6 offensive rebounds through a lack of basketball sense. Hawkins in still trying to figure out what he can and can't do against high level competition. Early in the season he was able to do whatever he wanted against the little guys and BU even said in his presser that was a disservice to Hawkins playing him out if his role like that. When the competition went up a level he struggled because he was trying to do the same things against better players and it wasn't working.
Hawkins is a smart and skilled player but is basically a freshman as far as playing time is concerned and for someone with his unique size and skillset it can take longer to figure out what he can reliably do in game action.