It's downright blasphemous to label guys like Jeremy Wray, Carrol and Lucas Puig as heelflippers, even though they might have good heelflips.
OP is asking for best heelflipper. Not best heelflip.
I say a heelflipper is someone known for their heelflips. Like Neen, or Blake Carpenter.
It's like asking for best deadly disease.