Just because Brock neutralized Mir, that doesnt mean he is "past" ending up on the ground against someone like Nog. Mir himself kept the fight standing because of how much he respects Nog's ground game.
I would LOVE to see Mir vs Nog happen again to set my heart to rest lol.
To be fair, saying Brock "neutralized" Mir is an understatement. Lesnar didn't "end up" on the ground. That's where he wanted the fight to go.
Mir didn't even stand a chance on the ground. Period.
Sure Mir respects Nog's ground skills. I do too. He's amazing. Unfortunately, I think he'd have a reallllly hard time submitting a freak like Brock. It sucks, but it's just the reality of things.