There are some wrong points in your reasoning, like the game having sold only 0.84(at least in theory) since thats only the physical sales numbers(so it sold more with digital), and that FE Warriors is a musou game, not really an action game(thus the appeal is lower, at least as far as I see).
But having said that, its hard to say one way or the other.Many of the fans already played 2, and I doubt they will double dip, so unless Bayo manages to bring in new fans(which there is a good chance of happening), I dont think its selling big numbers.500 K WW LT seems like a safe bet.(shipped plus digital)
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.
https://gamrconnect.vgchartz.com/thread.php?id=241866&page=1
