I accept that oviposting caddis tend to be females, yes
I have seen fast emergence (caddis popping up and taking off) and I have seen much slower emergence, where the adult caddis struggles to get airborne.That rarely are "hatching" Caddis on the surface for food due to the incredibly fast emergence and subsequent flight?
I am not sure what you are getting at?
What I do know is that (dry) caddis imitations are often very, very effective
Cheers,
Hans W