In fact without being horrid the act of rolling an aircraft accurately has been demonstrated with this pilot not to be simple.
What's the saying? one swallow doesn't make a summer. Your statement above is in fact being 'horrid' and potentially libellous. It (deliberately?) misses the point that the Pilot in question has previously won awards for aerobatic flying in competition, has flown close formation aerobatics (including rolls), and implies the way you've written it that the pilot has difficulty to adequately fly a roll. His previous experience indicates otherwise.