A: The stats change depending on your level and the actions you take on the previous bosses. I know the first 2 are definitely true, not 100% on the third.

I know if you're all at level 99, he becomes much tougher to kill because he definitely gains a ton more hp, and stronger defense. Not sure about the attack power.

If you cast KoTR, on Jenova Synthesis, he'll also have a massive hp gain.

And I haven't tried it, but my friend told me that each time you kill Bizarro's head, it'll knock off about 1000hp from Safer.

Q: What is Heidegger's official title? (as of VII, none of this prequel crap)