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Kakashi's eye is definitely MS. He called it that when he used it the first time. The reason he knows about it is because itachi used it on him when he performed tsukiomi on him. the retcon of itachi being a good guy takes that scene into consideration because even though he hurt kakashi, he also let him in on the secret of MS and that there was an evolution of sharingan he could strive for. saying its not MS, but an evolved sharingan is kinda pointless since MS is an evolved sharingan like Dengar pointed out.
also, my understanding is that more uchiha didn't have MS because it requires a latent ability of the user's own talent. not just any sharingan can become MS, only the elite Uchiha can do it. my hunch is that kakashi was able to acheive MS not just because of his own training, but because Obito had that latent talent. he was just a goof off and didnt train nor have the mental acumen of the elite ninja up to and during kakashi gaiden to showcase his true potential
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