Maybe, it would depend on how Mir's gas tank held up under the 10-minute first round. Like I said Nog could maybe catch him with something late if his stamina isn't there, we know Nog wouldn't have ever gassed back then.
If it's pure submission skill vs. pure submission skill I don't think Nog submits Mir. Takes him down and dominates positioning? Probably. He did it to Josh Barnett so I don't see how Mir would've stopped him from doing so. But if a submission comes it will likely be due to fatigue and that's not to say we know for sure that Mir couldn't have handled a hard 20 minute fight with Nog without gassing.
That's a fair response