Was Diablo really stronger than rimiru after being named?

Many say that Diablo was stronger than rimiru when named and after being awakened as devil lord until rimiru became true dragon. Sure rimiru was able to name Diablo because he possessed a lot more magicule than Diablo and energy(existence value) itself isn't actual reference for one's power. But Raphael(and later ceil) who is always concern for rimiru's safety never took any measure against Diablo like it took against Shion. Ceil blocked Shion's awakening and evolution of her unique skill master chef as she feared Shion's skill can be dangerous for Rimiru. But never took any action against Diablo even after knowing he is a primodial. We know that Diablo possess far more combat ability than rimiru but rimiru too has shown to grow more exponentially when fighting like his second battle with hinata where at first he was barely able to keep up but Raphael immediately learned future prediction and then all of her combat ability failed. Moreover due to his food chain, Raphael may have already anaylsed Diablo's abilities which further decreases Diablo's chance of winning. So I believe if Diablo and rimiru really fight(before rimiru's evolution to true dragon), then yes he might struggle at first as Diablo possess more combat ability and experience but because of Raphael, rimiru combat ability will just keep on increasing and will defeat Diablo.