In Gray's case it was more because he couldn't get a game at Leicester because of Jamie Vardy - that side were set up to play in a way (which admittedly worked fantastically) and everyone in the starting 11 had to sign up to and be able to do it.
Gray didn't ever really fit into that (nor did Ihenacho until Rodgers started to reform it with better players), but at a club where there isn't that way of playing he could go back to looking the player he was at Birmingham. Personally I think he - a direct, fast player up front - is almost exactly what we've needed for years and I hope we stick with him because we and he will see the benefit of it.