I don’t see how Naruto 689 there’s anything wrong with Kakashi having both sharingan and a perfect Susanoo. Nothing at all. Most of us wanted him to get both eyes. Now he’s got them. Not via transplant, sure, but what’s the problem?
naruto manga 689
Obito transferred his chakra / spirit into Kakashi – we’ve seen this happen before (e.g. with the Sage and Naruto and Saskue) – and it activated the sharingan. I’m sure there’s some explanation regarding the ‘science’ behind it, perhaps relating to the second hokage’s explanation of how the sharingan are activated in the brain and eyes, but I don’t care enough to nit pick. It fits into the story for me. And it’s exciting!
Besides, Obito says that it may not last (in his conversation with Rin) so I fully expect the sharingan to run out at some point.
I can’t wait to see what carnage is about to be released next chapter!!! I believe this is why madara so interested with obito when he found him half-dead. I believe this is the ability of obito mangekyo sharingan. Outstanding chapter.