Yeah... the tank-lifting thing...
Gregole is supposed to be fifteen times as strong as a human. Say a healthy, adult male who doesn't work out excessively can heft a hundred kilograms. That would allow him to lift a ton and a half, which does not justify the lifting of a tank. Even though we've seen him do it.
And did Zerbebuth claim to be ten times as as strong as Gregole? I remember he claimed to be three times as strong... (checks) Yeah, that's what the wikia says, too. And it states that Derzerb, for his part, is 60 times as strong as a human.
I wonder how strong the Enzyme-types were. Enzyme I seemed easily the equal of the Guyver. And some of the more recent Hyper-Zoanoid types would seem to have to be even stronger. And what about the Libertus, and the Unus?