Whoa those are supposed to be the type combinations? We've been asking for those for the longest so I highly doubt what we wanted exactly would actually be true. Another reason I still believe (and hope) those are fake.
That is just what the guy on 2ch said.
Although, Mijumaru becoming part Fighting is defiantly realistic considering his evo's look like they follow a samurai "theme"
And if Wotter is part fighting then Pokubu can't also be part fighting. So if I were guess a second type for him other then fighting it would be dark considering his color scheme being mostly black and he has an "evil" look about him (think Ganon from Zelda).
So take my amateur analysis as it is...