It's most likely this than anything else, honestly. Most fighting games (especially Anime fighters like BlazBlue) don't sell on Xbox 360 compared to Playstation platforms. It's a simple fact.
You should have waited like... 2mins longer to make your post. the one above it kinda shows you to be wrong here.
Fancy hearing me on an amateur podcast with friends gushing over one of my favourite games? https://youtu.be/1I7JfMMxhf8