Look, go onto Nintendo's Japanese
Mario website. Scroll down to where it says
Mario Plays.. Are you there? So which four game series they feel like plugging? Kart, Tennis, Golf, and wait who is that? Oh it's just
Baseball.
Okay well that's random chance. Sure. Now go down to the Character page. You can see the Mario cast here. Now click that yellow rectangle to see some alt looks. Oh hey, three of 'em play baseball now lol. Odd. Not even one golf alt. No soccer anywhere. Got 150 different character renders for everybody to choose from and yet three of them get baseball themed ones. huh.
Sure it's conspiracy, but it does make sense that they keep putting out Mario Sports titles on Switch. Ya'll see how they sell. They are the definition of a dependable million seller. They do just exactly what Nintendo needs them to.