I think they can build Khasan up slowly, not that he isn't ready. I think it's safe to say Pitbull will be done by the time Khasan reaches a title also, I don't think Pitbull has more than 2 or 3 fights in him before he really falls off.
Timur Khizriev
Aaron Pico
Adam Borics
Henry Corrales
Some of the more fun fights that could happen.
I think Bellator needs to keep signing blue chip Featherweights though as there is a lot of them out there Losene Keita, Salahdine Parnasse, Dawid Smielowski, Bibert Tumenov, Islam Omarov, Gabriel Santos, Evgeniy Ignatiev, Mukhamed Eminov, Wellington Prado etc. It really just takes them picking up a handful of guys like this to where the landscape in a couple of years looks entirely different.