They already tried to do that, but Badr backed out after getting knocked out by Overeem in K-1, didn't wanna lose to him in both disciplines I'd guess. Alistair talked about it in the 'Voice vs' interview with Schiavello, worth checking out if you haven't seen it, I posted it in the SF section. Alistair vs Badr under MMA rules would certainly be an interesting fight, but I don't see it happening.
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