Im gonna end this here because Shogun seems to understand what i was getting at with this and different scenarios having or not having a diminishing return, and i dont think im gonna convince you, im saying the misue of the cooldown has caused a diminishing return by the definition of diminishing return you used earlier. If you extend to 60 seconds, rampart and sentinel wont have cooled down so the spread out scenario has still mitigated the most damage. But I digress, my point here was to show OP how blackest night interacts differently which i did earlier.
On Aurora, saying it could be better doesnt make it bad, equilibrium cant be targetted so its usless in an off tank scenario (n flash not withstanding), and im yet to raid with a paladin whos healed more with clem than I have with free aurora. That aurora buff you said sounds nice, doesnt make the current version bad, literally free heal is really good and can be used to great effect