User blog comment:Rfx9416/Theory: Eustass D. Kidd/@comment-1595565-20141115024319

There are tons of other places when the anime does that when they have nothing to do with D. Luffy knocking out Bellamy, there was at least one from when he first fought Buggy (when you only needed half a hand to count how many people Luffy had in the crew), and tons of other places. It's really just meant as a way to "preserve" big moments. I doubt that any more supernovae will be D's. It would just be overkill and feel like a cop-out.