So the "Rowlett will become Grass/Ground" theory is finally dead? Thank god, that was stupid
Still haven't watched the video, but I guess all there is to see is new footage
I wonder if Pokedex Rotom will be playable and what type it will be if so
Also, on the typings and the legendaries in general:
I believe Solgaleo and Lunaala are not supposed to be the sun and the moon themselves but instead to represent them in the Alola region, sort of like what Angels are, messengers of the Gods(which the sun and the moon are in Hawaii iirc)
Steel and Ghost are weak to Fire and Dark, repsectively, which would mean they take 2x damage, or, in other words, they amplify the powers of the sun and the moon
Even without having the types, their moves still clearly show Fire and something-ambiguous-thing-that-could-be-interpreted-as-"Darkness", meaning they're borrowing the power of the Gods.
Just my two cents on it
Also, I don't know if this was ever mentioned here but, Lunaala literally means "Moon Wing" in Latin and "Galeo" is close to Galea or Galeati which means helmet, thus making it "Sun Helmet" /themoreyouknow
Helmets are made of steel so there is your reason for the typing