off the ball
which are probably the most important attributes for a DLF with a support duty. Ronaldo has all these attributes over at least 15 bar teamwork. Rooney has most of them, so I'd say those two are the best. Higuain, milto and Tevez all have at least 13 in these attributes so they are probably good too.
EDIT: Rooney's PPMs suit this role too. Messi's lack of stength is a dissapointment but other than that he is suitable.
But if you want to be less picky, the most important attibutes are passing, creativity, strength, decisions, off the ball, teamwork and dribbling in my opinion