if MayPac2 happens they gonna need a stronger undercard to sell it. Badou Jack is with Mayweather Promotions and he wants to fight on the Floyd undercard in September against George Groves but since Froch wants a big Vegas fight to finish on and hes now Mayweathers new BFF, both The Cobra and The Ripper are champions and it would be a really big fight for an undercard :bbb both got KO power, it would be an awesome fight
A rematch would definitely need a better undercard since the main event won't be as intriguing as the first encounter was to completely carry the show and overshadow other fights. No, Carl Froch won't be on the undercard and it's rather idiotic to assume that. I'm expecting Thurman, Broner or Maidana to have interesting fights on the undercard.
Why would it be idiotic to assume Froch would be on the undercard? he wants a Vegas farewell, he'd be fighting in front of the biggest televised audience he has ever fought in front of, he spent all of MayPac sucking up to Floyd and he'd be fighting a fellow champion in Badou that he would think is beatable