Chael would definitely fight a lion as long as it's sanctioned and there's someone there to pull the lion off as soon as he tapped out.

Cormier vs Chael would be hilarious to watch.

No way in hell he takes Cormier down, and I'm pretty sure Chael has never outstruck anyone....ever.

But he's likely going to retire after Jones smashes him anyways, so this is all very hypothetical.