ogre3000

Fusion with no sea water weakness wich means he can fuse with sea stone...basically anything that has a devil fruit is considered dead when facing him so besides shanks and Garp anyone else has no chance

Well Aizen was his kido teacher to be fair gues naruto was abit overzealous while studying under him

The one piece world at a minimum should be 2-3 times the size of the bleach world however certain information point to the one piece world being 10-20 times the size of the earth information like there being 20 million islands or that Arabasta is about the size of Australia or that a 35 km giant elephant apparently is very hard to find...so yeah that would make island buster in one piece basically continental in bleach