1. Doubt Hearn can afford Broner because you are gonna have to put a 7 figure deal in his lap and can he justify that in a non world title fight
2. Broner would beat Benn
It depends on whether Hearn rates Benn enough to give him such a high profile fight.
Having double checked Broner's record, I also think he could 'win' against Benn but whether he would get a decision on British soil is another matter. The UK is becoming one of the worst places for shit biased judging.
However, can Broner match Benn's desire? Will get up at 3am for long runs and kill it in the gym?