this is only one, personal theory,

for what they have read the manga, most recently, I could say yes, indeed,

Robert. Lisker. was zencrebe

Is it possible he was already a Hyper-Zoanoid when he re-married? Assuming this is true. Which, I must confess, I doubt. He was from upstate New York, and this was the Toronto base.

Also Zencrebe (Zenkerb) seemed beefier in his human form than wiry (and old) Robert Lisker. Then again, if he was processed later...

 

Oswald was meant to become a Hyper-Zoanoid. When he died, perhaps Robert took his place. He didn't seem to have siblings, and they would need someone very reliable to become such a powerful Hyper.

 

Huh. I'd say there is some merit here. In a retcon meaning, anyway.