Thanks nugpot
Ok here is a scenario for you. You have started the #2 engine with a GPU and then the GPU is removed. You now have just the #2 DC GEN available. Now are you required to unfeather before starting the #1 engine ?
What I am getting at is that unfeathering the propeller will bring the #2 AC GEN online and via the TRUs will power the secondary DC buses. However neither of these will influence the start of the #1 Engine.(#1 Starter would be powered from left main DC bus)
Just wondering if there was any electrical advantage gained in by the prop operating out of feather, that would be beneficial when trying to start, the opposite engine ?