From: Anagram | #016
Why did Tifa not correct Cloud's memories? She must have known something was up as soon as he started his story about Sephiorth in Nibelheim. And wouldn't she have noticed that Cloud looks exactly like Zack, whom, admittedly, she only knew for a few hours so it would be like Zack looking like Cloud, but still?
And come to think of it, why did Cloud have glowing mako eyes, which are mentioned every third sentence in this game, if he was never in SOLDIER? Why is he powerful and capable at all, actually?
First question: What in the world is she supposed to say to him? "Hey Cloud you big dummy you weren't there stop talking like you were how do you know all this stuff anyway?" She was every bit as confused as he was.
Second question: Although Cloud was never in SOLDIER, he was still injected with Jenova cells during that 5-year period when he was being experimented on in the Shinra Mansion basement (Trying to make him into a clone like all the other townspeople). Hojo considers him a failure because he doesn't have the same reaction to it everyone does. Becoming a member of SOLDIER means being injected with Jenova cells.
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http://i.imgur.com/CbfFb.jpg