This question has been answered several times before and you just had to search for the answer in the forum. Anyways, for the super rare question, it isnt guaranteed that you would get Ay after getting sasuke or vice versa. Once you get your first super rare, the counter resets and the next pull could be the same super rare you got or the other super rare.

Unless you have money, it isnt worth trying to get roshi to 4*/5* since you won't be able to get the full 80 frags unlike the first time.