Perhaps it was the hamstring problems but I never really saw the pace which Gray must have had. Only saw the Clarets live once last season and at Watford he was outpaced by Kaboul numerous times. The first a diagonal run where he had 5 yards on him, I thought 'here we go' and proceeded to watch Kaboul overtake him with ease.
Gray has a lot of the raw material for a great striker, he's climbed the divisions rapidly and perhaps he needs a few seasons to find his touch which isn't great.
Good points on Dyche getting players to improve, remember the Huddersfield fans and their comments about Arfield. I sense Wells is just there to offer something different, we seem to have a core starting line up with a number of players (such as Wells) offered the chance to impress and make a statement when the chance comes.