Alex_Clive
This is a god ritual, what do you expect? A fusion between 5 chakra natures plus yin and yang should make any character really overwhelmingly powerful. It's a little hard to imagine Donzo of all characters achieving this level of strength but it is what it is, Donzo is getting his glow up. If it makes you feel any better, he still ends up dying. The other villains aren't really that much stronger compared to their cannon counterparts besides Obito and Nagato. Everyone else is relatively the same, matter of fact the only characters who managed to get overwhelmingly stronger at this point of the story is Itachi and Shisui. Both got hashirama cells and Shisui even got sage mode. These guys could probably solo the Canon Akatsuki including Nagato
So the Author gonna escalate it to the Rinnegan? Hmm, quite a development. Above is the Rinne-Sharingan. Well Senrigan is on another level that doesn't mean that Rinne-Sharingan could evolved further like a Senrigan, but not completely impossible, to be Omniscient, Omnipotent, or Omnipresent, either the 3.