When you mix the different handeled duplicated input signals you risk phasing cause of microdelays. Sounds sometimes bit crazy… (but theres a good chance, that you won’t even recognize it)
If I want a “wet” aux, I would route it conventional on an fx-send, and the return into the aux mix.
If you want a special reverb and eq setting on the monitor, other than at the mainfront, I would split the signal (2 channel with the same input) one is routed to tha pa, one is routet to the monitor. If you need different reverbs on the monitor, and you want to spare a bus, you could insert the reverb into the channel for the monitor.
Everything as you need it.
Hope I could help.
Goodluck, and rock´n´roll