1 and 2,those ninjas are not released yet in our version,Kurama Naruto i believe is in Great Ninja War treasure,edo Hashirama is like Itachi susanoo,you get fragments only in treasures.They will be no doubt in events,but for costs,i think at this point nobody can tell.

3,what ninjas you have?I read that with 300 seals at reabate as we had right now,you can get both Han and Roshi,if you have them,and have some kage rares,better save for the future.