It just wouldnt make sense to make it Switch exclusive. They HAVE to make the game compatible with a regular controller on the Switch since its a hybrid, so why not put it on the other consoles and make way more money? Also they have released The Complete Story on both PS4 and XB1, so I dont think they would make another console version not available to that fanbase.
The only reason I could see them do it would be if they made a deal with Nintendo. A very expensive deal for Nintendo.
Yeah, I agree that they are most likely full multi. Going back to doing the spinoffs as handheld exclusives doesn't make sense financially unless Nintendo were to moneyhat them, which I don't see happening.