My CK specialist had best ratings and most MoM for last 2-3 seasons, my SS is a leading goal scorer for many seasons, along side my quality-only AMC. My FK specialist had 14 MoM in an earlier season and led goals, ratings, and assists. My aerial specialist probably shows the specialty sign most of all. 2 walls, sometimes still lose on FK, 1v1 GK isn't any more consistent than my GK without. Had a dribbler who rated a bit higher than usual....PMs are often flashing specialty sign.

I think each player might or might not be for an SA, add one to wrong player and maybe it's useless. But gems I've spent on CK, SS, Aerial, FK... those at least I wouldn't trade for higher Q.