I'm pretty sure Gunna mentioned Amir because of the potential payday and sporting event, not necessarily because of it being a challenge.
Personally, Amir is only fun to watch get KOd, but English boxing fans are always fun at matches.
Floyd will probably never get close to sniffing another 2.0 million PPV buys again. Even if he fights Canelo sometime in the next 30 months. When he fought JMM, that only did 1.1 views. Guerrero fight most likely won't come too close to that, he's not a true Mexican boxer.
The only way he sniffs that PPV buy rate is if he lets Manny have a shot at him. But we all know where that stands.
Who else other than Manny and Money get PPVs anyways these days? No heavyweights like days past, unless the Klitschko brothers count since theyre on Epix. Ward is a monster in terms of P4P race, but he's never even fought on PPV. Maybe if JMM fought another Mexican, but even that seems unlikely.