24 hour Raids help!!

I just wanted to know do the other raids ever come back or are they gone for good? like the Mihawk raid, Garb, Black beard... do they come back? cuz I have no hope in hell of beating the new ones like the Doffy one we just had.

yes, they come back
until now we got sometimes an old raid boss, but really rare
if there was one, he was unannounced on Friday

but in jap there is every friday an old raid boss, global should get that too (I hope soon)
Last 3 Fridays was always a raid boss, so it could be, that they already had begun to bring every week one...