its about lucky
if u lucky,u can get A,S,SS Crew
i just use 250gold to advanced call-up,but i can get Enel and Crocodile In Day
if u unlucky
u need more than 250 gold
Low call-up :
i use that,and i get A crew,like morgan,bellamy
but i never get S crew with low call-up
dont use Super call-up,because u can recruit just 1 crew,but it can A,S,SS crew,if u want,u can try it