None of Manny's assistants have distinguished themselves any more than the offensive staff that got axed. The key difference is that they had the benefit of not being in a flawed, defective system. D recruiting has been nowhere near good enough.
Rumph, worse than being a bad recruiter, actually repels kids away. Banda has the will and energy but repeatedly gets played. And Patke? Who's he going to bring in? Simpson, he hasn't shown much either.
If Manny is really the savage that many think he is, and truly serious about winning at the highest level, the purge should not be done.