Groves turned down a 25% cut knowing that he's entitled to only 15% if the IBF ruled in his favour. There's no way Matchroom/Froch will risk losing the fight to another promoter through purse bids.
If Froch dumps the belt Groves fights for it and gets to sign with any promoter he likes. With the fame he's got from this fight and with a "world" title he will be big business. And he gets to claim Froch ducked him.
You could argue that it's Groves that doesn't want the rematch.

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