User blog comment:Zombiejiger/Showa Godzilla: Final Wars/@comment-3364111-20130922035804/@comment-3542924-20130922041445

If Gorosaurus actually did appear in the movie, he would probably look like something you would see in Jurassic Park

As for Kiryu and King Ghidorah, they would obviously use the same suit from Godzilla: Tokyo S.O.S. and reuse the GMK King Ghidorah and replace the Varan-like fins on each side of all three heads with a mane for each head to make it look like Showa King Ghidorah

All of which is what I believe if those 3 actually did appear.