Hi! The reason we don't allow comparison trivia is because people tend to and will nitpick every detail about the comparison. To use subject at hand, there are loads of animes and shows that attack in a similar fashion to Sirius, not just Gundam. It's more of an anime trope than it is a Gundam/Sirius thing. If we compared every little detail about a character to other characters we'd make a a whole page of it! We don't want to do that unless there is an explicit reference to that, such as if the Gundam character who pilots the armor shouted a specific catchphrase when they used that attack and Sirius also shouted that catchphrase. Then it's something to note. Otherwise we're just nitpicking.