Apparently Marco [DIRECTOR & MAIN ARTIST] mentioned in the v2 interview that the song was remade 3 times, Apparently that isn't really the case at all, Because the older version is V2, That's because of the clear detail of both omega & the goons sections. That means the first time would've involved the mario heads, the OG Ultra m / GB & GX. I wanna mention that a couple seconds before the og act was done, It sounded like the voice for comedy rather than ultra m so we know what the original voice for comedy sounds like.
I don't think many people realized that ultra m wasn't intended to be horror mario, During the v1 intervew, Marco stated that GB can enter any version of the game if he wanted to, All stars was intended to be GB's third song, That means gf wasn't intended to be part of all the overworld songs in general, Meaning act 2 + 2.5 were meant to be one whole act and probably act 4 being the same as the final, What we can confirm is the og design for ultra m wasn't scrapped but rather reworked & redesigned to be ultra m's 3rd phase, This could also mean that Starman slaughter could've also been the second GB song.