The GN Flag II (tentatively titled as it may be) might be inspired by the Susanowo, but it is NOT the same thing, so I don't see why it's tagged as such. That would be like tagging the Susanowo as a normal "Union Flag" or tagging the Hizack as a "Zaku II". Hell, the Susanowo has more in common with the Masurao than this, yet they are tagged separately so there's really no excuse here.
It's tagged both because it does not look completely like the GN Flag II or the Susanowo. If something in a post is ambiguous then its given both tags.