[Corvina]

Yeah, I know where you're coming from, but you can also see it the other way round.
If her (hardcore) fans want to help her keeping her streak it's better she has competition so the fans have an appeal to buy all versions or even more. If she releases on a date without competition why should they buy so much versions? She's still big enough to sell a good amount of copies to get No.1 on a date without heavy competition.
At the end it depends on multiply factors, not just the release date and the competition. She has to have good songs, good quality, to begin with. So we have to wait what Avex will do and how it'll turn out in the end.