Also, this can mean that we can't have most of the Heisei monsters anyway aside from Heisei Ghidorah
No, if they're going to include said monsters, they should just give them movesets based on how they move in the movies.
One perticular case I would also like to bring up is Godzilla 1954. I'am not sure where he would fit in this. His real stats claim that he weights the same as the Showa godzilla yet he appears more bulky and massive. I suppose giving him more of the Shinsei goji/ Kiryu's movelist would fit his character better. The one in GU is just wrong.
Or they could just not include him. He's serves no point in being in the game other then he's the first Godzilla.