there are quite a few exceptions - Dunk, Greer, Lua Lua, Bridcutt, Barnes, Murray, Calde, Crofts, Bennett, Elphick, & Wood all in the Prem or doing pretty well in the Champ with us or others.. All without Gus as their manager.
Barnes, Murray, Bridcutt*, Elphick, Calde, Greer, Dunk, Lua Lua and Ulloa all seemed to do ok once Gus was no longer their manager.
Perhaps not Bridcutt. :)