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I know its not FK SA but I currently have been testing CKers. I have a left footed MC
No SA (105Q Crossing) and a rightie MC (105Q crossing) who I gave CK SA to. The rightie's performance in general has fallen since he got the SA and he has had only 2 assists to boot, compared with my leftie no SA guy who has had 14 assists.
PS. The rightie wasn't actually much good at CKs before the SA but I wanted the test and I was prepared to waste the sp to do so.

PPS. Whether being given responsibility for something he's not good at has affected performance (or whether his performance slump was coming anyway and affected CKs) I'm not sure - so I'll be removing him from CK duties for the rest of the season. If he starts performing better I might give him more CKs.