It's feast or famine with Holloway. His successful spells were when he succeeded decent managers. Grayson at Blackpool, Pulis at Plymouth, Freedman at Palace.
Against that he had a hand in two relegations in one season (Bristol Rovers, QPR), also relegations at Leicester and Blackpool as well as potentially Palace last season and probably Millwall this season.
It looks like he's been found out.