Literally no ninja has worked so hard to earn and create one jutsu as Kabuto Yakushi did with ET. Hear me out.
The main argument i've seen is that it's too much of a 'broken' jutsu and posts saying Kabuto doesn't deserve such power since way back when he first used the tech. Well...that's quite possibly the dumbest point i've seen.
- Worked with Oro to adapt it in the first place.
- Deciphered the Uchiha Tablet
- Years of testing.
- Took Oro's cells and implanted them into self which was painful AND took genius medical knowledge to do.
- Learned all the dead ninja information, techs and locations. Even ninja from decades before him. Thanks to his...ninja info cards
- Collecting and graverobbed all of the bodies without getting caught.
- Mastered Sage Mode through his own skill which even Oro could not.
- Bought a bunch of nifty capes.
- Perfected the Jutsu himself.
- Collected a bunch of dead bodies to use as sacrifices. Graverobbing 50+ corpses and DNA collecting from ninja lost decades down the line takes time and knowledge.
- Modded a perfect prime form of Madara Uchiha.
Forget Susanoo, Rasen-Shuriken, Wood Style and Byakagou. It took a resourceful, sneaky, powerful medical genius to perfect and use such a jutsu and people should give credit where credits due.