I am a bit confused what I should be giving my DMR/MR and DML/ML for special abilities when I have the chance.

Freekick seems a waste as does Shadow
I never give Penalty
I might give Wall, but not Aerial
Dribbler is also a choice, but I give that to my MCs usually.
Playmaker, not really as I give that to my MC or DMC.

I would tend to give Corner as I dont usually give this to MC/ST/DC types. Does that make sense?

I want to give him an SA so I can sell him easily as I just bought a 5* 18yo to replace him.

I am selling him to my lower account and just really dont know what to give him other than Corner.