Res should take a look at Ronda's last fight, someone who beat Rousey like a drum and did it with her fists. Imagine how much quicker and stronger Mayweather is and how his punches would absolutely destroy Rousey, just like Nunes did.
If they announced a "fight" between the two and gave them three months to prepare, I have no doubt that Floyd would train with MMA types to get a real look at what would be coming, but if Nunes beat her like she did, Floyd would just crush her. Res is a great poster here, but to suggest that Floyd is marginally stronger than Rousey, or think that any clinch would favor Rousey is a big reach. Suhreal's comments are spot on.
Now, if some average Joe at 135-140lbs who fought occasionally stepped in with Rousey, I'd say yes, she'd probably whip him. But Mayweather would flat out beat her worse than Nunes did, and I'm 100% sure about that.