lol, there were way too many things to quote so I'll just say it like this, we don't really know
anything about shisui, and just because they were alive at the same time doesn't mean anything since we don't know shisui's whereabouts, so that proves nothing.
and this thing with Ao. here's an image from manga, he appears to be of some age
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and look at this one, Ao says he was the one who saw through the illusion placed on the yagura, Ao was around even then, and then he goes on to say that he once fought wit shisui. he should be quite a bit older that itachi, itachi was 4 years old when the war ended, he never fought in it, but shisui did.
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and look at this one, remember Ao says he fought with him ONCE, and look at the picture of shisui when Ao is remembering him, he looks the exact same years later when itachi pictures him, why? is kishi trying to keep us off the trail of his age? we never see an older or younger shisui.
and we don't know what his other eye tech was, in fact, it's been made so far to look as though every mangyeko user has an ability in each eye, but we only know one of shisui's.
and yes itachi supposedly killed him, but pay attention to the words kishi had itachi speak, " I helped him erase his "existence". now why the HECK out of all the things he could have said, he said "existence". heck, he could have just said, " I helped kill him". that's really odd IMO, there's definitely more to shisui that meets the eye.
I also like to add that shisui was a mangyeko user, but yet, we know nothing on how he obtained it. and remember this was something that was very rare for an uchiha.
