I'm going to go for Diame because his turnaround was unexpected and pivotal. Thought he was going the way of Geremi but instead went full Viera on us
Lascelles, Shelvey, Perez and Dubravka are my top 5.
Letdowns of the season:
Clark (Shame but he couldn't cut it)
Darlow (Threw it away too many times)
Gale (Not sure what was affecting him at the start of the season but it cost him momentum and is lucky his only competition was Joselu)