Welp, that confirms it.
Prime Rocks = Harald.
Harald was alive, world-renowned and well into his prime by the time Roger and WB were top 2. Yet, after Roger died, Whitebeard became known as the WSM and king of the seas. Same Whitebeard who was stated by the narrator to be <= Roger.
Thus, Prime Roger >= Whitebeard > Rocks = Harald.
Never bet against the Pirate King