There have been plenty of headstrong individuals in the England camp over that time. The only other player that would really be deemed "toxic" was Yarde. Farrell and Itoje in particular are very headstrong. Tuilagi, Haskell, Marler are some of the "naughty boys" yet all got selected, some over multiple coaches. I have a suspicion that Cipriani is less "maverick" and more "head lodged firmly up own arse not listening to anyone else".