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I think that the risk of being written in to the history books as him/her-wot-dunnit is something everyone is trying to avoid.
Grayling seems impervious to his fuckups but they are small fry compared to the potential fallout from a 'grabbed, parliament bypassed' no-deal, which would be firmly levelled at the guy in the wheelhouse at the time.
But yeah they'd take a no-deal if parliament was seen to endorse or sleepwalk in to it.
Someone like JRM could do it and then piss off to a thinktank or the House of Lords. A lot of them are old and rich...