Great question about the downgrade. Slots 1,2,3,4 of the Mk 1 pole match slots 1,2,3,4 of the Mk 2 pole. When you downgrade, like deleting, you lose the slots 5, 6, and 7, and their respective power connections disappear. Upgrade back to Mk 2, you have 5, 6, and 7 freely open to connect things to.
Downgrading is not an issue!