I don't know. He doesn't really exhibit any signs of damage after returning to his humanoid form. He has more energy than Jackie Chun, but he has low energy as well. But it seems it's attributed to his hunger, more than his damage. Not saying damage isn't a factor here, but that's the sense I'm getting.
You could very well go with that though, that's what happened to Vegeta and it's very well likely it played at least a factor here in Goku's fight with Jackie.
It's quite possible the only time we see a fully powered Oozaru in the manga is when Gohan transforms.
Ah. And that probably all but cinches the debate now doesn't it? Great Ape Gohan >> Piccolo pretty much confirms Oozaru has to be 10x now doesn't it?
My only question then is, could Great Ape Goku survive Roshi's mountain blast, moon buster at full power?