I'd go:
Leadbitter
Clayton
Crooks
Ramirez
De Roon
Leadbitter needs no explanation, I wish he was still here, just a shame age got to him.
I debated having Clayton this high given how much he dropped off and how little he contributed beyond the halfway line, but for 2-3 seasons he was an excellent defensive midfielder who gave his all for the club.
Crooks has been one of my favourite signings in years, a real goal threat, surprisingly decent on the ball and most importantly a character who seems to enjoy being at the club.
Ramirez was exceptional for a year before he spat his dummy out, I'd have him higher if he hadn't really annoyed me.
De Roon was good in a shocking season, I think he'd have done ever better in a decent season.
Howson has been outstanding under Wilder, but I do think he's been a very underwhelming signing overall and his good performances before this season were in defence.