That's a strange way of looking at things. Players can improve, managers can change who have different perspectives, injuries can happen, there are countless reasons why a player can end up being a good fit for a club when he wasn't previously.
He was good enough to be in Leeds starting line up in the championship but he wasn't getting played .
Was he good enough? Think he's had the best spell of his entire career over the last 12 months. A lot of Leeds fans are pushing for them to get him back though given he's performing better than Aaronsen.