I think he has benefited with the obvious time spent coaching him by the manager to play a totally different game from which he and other keepers are used to . Made a few bad mistakes in the first part of the season ,until he got used to things . Fair play to him he has adapted well.
But now lots of teams are playing this way with keeper well up the park. Good shot stopper , no so good at positioning and comming for corners tho. Would be happy to keep him or sell if good offer comes in.