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Check to see if your keypad or Rio has two cables going to it. It may be that the installer has the bus from a+b and power going to the device and then coming back to the panel casing and connecting to the other devices cable. Eg. From panel a+b to keypad and from keypad back to the panel where it's joined to a cable going to the Rio.
I'll flick open the ROI and have a look what's going on in there!
You can keep the sensor power wiring the same in the terminal block and just wire to the left hand vertical power connections. This will keep your zone wiring tidy at least and avoid the need for cramming four 0v wires in each panel terminal.
Nice one - like you say keeps things tidy and saves a load of messing about!