You've still not given a historical source for Bolingbroke using that legend as his claim to replace Richard. And it's much more reasonable for him to use his right (legal or otherwise) as hereditary High Steward of England, and thus able to stand in for the king when the king cannot rule, than to make up a story why Richard isn't even king anyway.Remember who Bolingbroke was never a regent and needed something for replacing Richard II who was an adult male and the indisputable male heir in the male line of Edward III, so he used the Crouchback’s legend first (and then said who Philippa of Clarence being a female and daughter of a son dead before the father was not entitled to a place in the line of succession or at least not to an higher place than her father’s younger brothers). In any case considering who Edward IV in affirming his right on the crown make an explicit reference to Edward I being his father's oldest son and Crouchback’s the younger is almost sure who the Lancasters used that story for claiming the crown.