I bet that really shortened the perceived deco obligation by the VR3 and is probably the best the reason I've read for moving the O2 hose to the exhale side.

I think for Megs without the 4th cell, moving it alleviates a small hazard, but creates a bigger one. ie. hypoxia vs hyperoxia and how quickly the diver succombs to them and how quick the response needs to be

Thank you for the insight on the 4th cell. It may be in the future for my rig.