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Something that recently popped into my head but what if the positions of the brothers had been switched around? Say a French rebellion or something along those lines occurs just before Richard goes off on the Wars and he has to stay behind to sort out the mess but sends John in his place? What's likely to happen with 'Softsword' leading the English Crusading Armies instead of 'Lionheart'? A less successful Crusade? Richard surviving to break French resistance utterly?