IMO Ryan Blair has been our most influential midfielder and he has become the effective fulcrum for the team. He has also shown a great degree of consistency, something which I think is often overlooked, and which is ahead of the others you mention.
Re Joe McKee, he is still a very useful player but he is not now the guy we had first time around, and I'm struggling to recall a notable dead ball this season. Gray has a brilliant engine as you say but his energy sometimes needs harnessed. Wilson has taken his chance well and currently deserves his place.
As for Ally Love, just concentrating solely on playing football minus the histrionics and we'll all benefit.