Porter Brook is next month, he could easily get the winner in late 2016 if he wanted to, they're all PBC, no problem. And Kell Brook is on record saying he wants Garcia and would travel to the US for the unification fight, because he wants to build his name in the US. Also Spence has to fight an eliminator bout to be Brook's mandatory so Kell and Danny could definitely happen now if Danny's team wanted it. But him, angel or whoever is managing him probably don't want any of those options right now. They never even mentioned them as an option, but they called out Berto the second after he got his win.
And Berto is a solid welterweight with power and all that but like I said, he's on that borderline to being shot and that seems to be why they're going after him instead of the younger elite fighters in their prime. I'm not saying Berto is a guaranteed easy out, but he's not those other dudes.