Yeah and they have been working on MP4 for 4 years now and we know nothing. Not a single screenshot. Not even one piece of concept art. This is just silly at this point.

If you bought any of the games digitally you don't get both, but you do get a 80% discount on the other one. Nintendo probably counts it as a sale everytime someone uses the full game download that comes with the physical version of Bayonetta 2.

Not that unusual. Shin Megami Tensei V and Bayonetta 3 also didn't show anything before they were a year away from release. It wouldn't be surprised to find out that MP4 is going to be holiday game next year.

It is pretty unusual not seeing anything for a game announced 6 years ago. Im sure it will come out eventually. It will just have to be an industry changing game just to live up to the hype at this point.

It's true that it was announced 6 years ago, but it have only been in development for 4 years, due to the previous developer not doing a good enough job. I wouldn't hold my breath for an industry changing game. I'm sure that the game is going to be great, but industry changing games happens so rarely that have a lot of doubts that any such game is going to be released any time soon. Personally I will be satisfied if the game is just as good as the first one, even if I had to wait 6 years for it.

Well the first one is one of the most critically praised and beloved game of all time, so yeah, MP4 has quite a battle ahead of it.

could star allies sell 5 million and be the second best selling game in the series?

No it's not. You know that.

Then what games are?

https://en.wikipedia.org/wiki/List_of_best-selling_Nintendo_Switch_video_games

Dark Souls Remastered is also at 1.15 million. 

Other Bandai Namco games were updated as well.