Of all the overrated trainers, I'd have Olly Murphy at the very top.
Also, Skelton has had lots of ammunition to date but not sure he has more than 1 grade 1. Third Time Lucki, a case in point, looks great up against lesser animals, comes up short in decent company, then moves onto chasing, looks great against lesser animals. comes up short in decent company, drafts for two years until well handicapped.
Going into Cheltenham last year, Hobbs had Sporting John, Thyme Hill and Defi du Seuil. If anything it was a resurgence. Shouldn't be in then same list, as you suggest.