I highly doubt that, but I'll admit that there's a possibility. What I will say is that, if that does happen, it will probably be more because Cain's body is shot and battered at this point than anything else. As it is, though, Browne isn't on the same level as guys like Cain, JDS, Stipe and Werdum. He's just not. The dude will never be a champion.
If Cain shows up in championship form, I can't see him not absolutely running through Browne and finishing him in one or two rounds.
THIS .gif, however, gives me cause for concern: