The Zab who fought Floyd in the first 4 rounds against Baldomir in a rematch would destroy Baldomir.
But the Zab who fought Floyd in the last 8 rounds would have dropped another to Baldomir.
So in a way I agree with JonesJrMayweather. The mental game, when to your advantage, can overcome glaring skill-level differences.
If Baldmoir and Zab had a skills competition, Zab would beat him in almost every category.
But the fact that he can't sustain it in a 12 round fight is more than half the story.

Zab could've beat this guy if he did this...
Zab could've beat that guy if he did that...
The fact that he doesn't do those things is the story.

But all in all, Floyd vs. Zab was a great fight choice in my opinion.
Zab has the tools to stop a mayweather.
The main tool, he can match Floyd in speed when he wants to.
Of all the 140-147 fighters, I believe Zab has the best chance at beating Floyd based on speed alone.
So the fact that he took this fight with the reward of a paper championship, and the risk of severely tarnishing his reputation with a loss to Zab who just came off a loss to Baldomir, it was a pretty big gamble for Floyd.
Risky fight choice that paid off.
Great fights to come.
Floyd is on his way.