To me, shadow striker.. I had few and they all sucked (most of them were AMC's)

FK and CK specialists were (most of the time) great for my team.. I used to have AML-FKS and AMR-CKS for 2-3 seasons and they really rocked.. I think my ST was scoring 5-6 more goals in the season after corners when I had that great AMR-CKS (headers).. and in the same time AML-FKS was scoring like 7-8 per season from FKs.. sadly it's much harder to find such a guys at higher levels (I'm at 12 now, I know it's not that high at all but comparing it to 2nd/3rd/4th season it's a.............. yea)