after watching more of Marquez and Mayweather.

[CutMeMick]

Here's an overly simple way to look at it:

Marquez just had a life-and-death fight with Juan Diaz. And I think we'd all agree that there's a significant gap between a 135-pound Juan Diaz and a ~144-pound Floyd Mayweather.

While I agree 100% on your view (and who wouldn't)

It can easily be countered with styles.

There is a significant gap between the style that Diaz brings and the style that PBF brings.
Unless you expect PBF to come out like Diaz.