If the crankcase vent is running to the airbox, the airbox vent/drain hole should be plugged. The airbox then acts as your crankcase catch can. The airbox vent can be run to a catch can, but it is easier to just plug it. If run to a catch can, it (the catch can) cannot be shared with anything else.
Radiator, battery, and fuel are optional to run to a different catch can.
As far as the fuel tank vent, I would just remove the hose and not run it to a catch can.
For fuel injected bikes, it is possible for rain to enter the catch can and be pushed (since we all know that vacuums cannot pull anything) into the fuel tank. Don't ask.