well... it depends~ CK is not 100% that give you a score. it just increase the chance (and it also depends on player's skill) yea PK also can be a good CK taker~
but i prefer that CK are in ST or AMX (X= R,L,C) because they are lack of defense skill...which means they have higher crossing, and passing skill in attack... while PM i prefer in my MC which the skill are average....so... that means their attacking skill are lower than ST or AMX in my team