I'll assume you mean Devon Moncrieffe? http://boxrec.com/en/boxer/565347 He might be a little small for Beterbiev, having never fought higher than super middle (and mostly at welter) - but his 25% kayo ratio means he does have a puncher's chance.
it's David Murray of course. There's a rumor going on that the Beterbeast is fighting again in December in a non-title affair, and guess what... Murray has a TBA (The Beterbeast, Artur) for December 1st. IT ALL MAKES SENSE! http://boxrec.com/en/boxer/664406
I thought he meant Danger Mouse. Not sure Beterbiev could take Danger Mouse, maybe Penfold. This content is protected
I would massively favour Dariusz Michalczewski to win inside the distance. Still Beterbiev hasn't had many fights and I may think differently in 2 years time but as of now I would pick DM