Just spitballing based on Dana's comments, but you're right that it's not practical. He kind of implied it would come out of left field, but maybe I'm overthinking. My only reason for mentioning Colby at all is that he's not really in the title picture at 170 anymore, and has always teased dropping to 155 ( or maybe some catch weight/165 title?). I know 300 will sell PPV's regardless, but I assume they still want a big draw atop the card.
Nunes /Cyborg wouldn't shock me, that's a good guess.
There are no heavyweights on the card either. On one hand, I'm not sure if they'd do an interim bout as main event, but Aspinall seems to be available. Do they get creative with that somehow?
At the end of the day I'm perfectly fine with Belal vs Edwards, just doesn't seem consistent with the teases I've seen.