Well Kabuto was already as skilled as Part I Kakashi, but yes with a little snake skin he became capable of nearly soloing a war with Edo Tensei
Sadly Nagato's character was ruined by losing the origionality of his Rinnegan.
Danzo was already extremely strong....probably the best Wind Style user in the manga. I'd replace him with Madara. As from the time he and his brother were born they quickly rose in the ranks, quickly got MS and then he finally got EMS. Immediatly on his rebirth he has become the strongest character except Maybee the So6P
Sadly Nagato's character was ruined by losing the origionality of his Rinnegan.
Danzo was already extremely strong....probably the best Wind Style user in the manga. I'd replace him with Madara. As from the time he and his brother were born they quickly rose in the ranks, quickly got MS and then he finally got EMS. Immediatly on his rebirth he has become the strongest character except Maybee the So6P