Okay Bizarro and Safer are a direct result of Jenova bonding with Sephiroth after the Synthesis battle. I've only said it a few times as a theory, but now I think there isn't any other explanation. Massive amounts of Jenova in a short time can produce mutations as shown in Hojo. Just how much is debatable, but irrelevant for now.
Noone in the game exhibits the psychic abilities, or the mutating abilities, people claim are Sephiroths, other than when Sephiroth appears to use them. SEPHIROTH ISN'T SPECIAL, he has no reason for these abilities other than Jenova.
Jenova can survive in parts, she can control people, she can change her appearance, she has unbelievable strength. Sephiroth has nothing, he is not stronger than Jenova, he has no reason to be, he never shows any reason to be stronger than her, he certainly doesn't have ridiculously advanced psychic powers purely from coincidence.
