At my league, I have an opponent, who has an really good assister - CK.
I don't know, how many assist from CK, but, if you look at his stats, non - for me - important skill to be a (good) CK is high.
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My PM and CK have way more skill at crossing, creativity,... but both together haven't 9 assists this season.

Just a thought: what's, if the SA ignores stats? Maybe that's the reason, why defenders can be good FK, CK, PK,... (kayattributes aren't shooting, finishing).