Initially on my car it was setup with one brake reservoir for front diff, one for gearbox and one for the transfer box.
Which means a total of 6 brake reservoirs in the engine bay, which again means it takes up alot of space.
The intention of these added brake reservoirs is to ventilate the diff, gearbox and transfer box.

So as i have a nice engine oil collector on the innerwing on the car, is there any arguments as to not run the diff/gear ventilation to this oil collector?

The oil collector has a 17mm breather hole, which i do think is sufficient for all these parts to breathe properly.
So backpressure should not be any issue... or...?