This had occured to me, but the fact that the "SMASH BOMBER" attack name is taken from the preceding series Jetman made me wonder whether a game engine HAD been started on, as Jetman, originally.

Presuming that it wasn't all just placeholder stuff until the American voices were recorded, and that it WAS based on a Sentai, this is how I think things might have gone.


- Jetman engine begins production

- While it's being worked on, Zyuranger becomes the current Sentai of the time. Toei doesn't advertise their previous Sentai over the new one, no matter how popular it is, so they decide to re-fit it into a Zyuranger game.

- For whatever reason the game gets canceled, and they shelve it.

- MMPR Mania starts, and suddenly it's like "Have you still got that unfinished game? Yeah, we need you to Americanise it"

The game didn't really have any American stuff in it, sans easily made music and sound effects. The rest was just Zyuranger stuff.

What would you make of the fact that most of the Game credits list people under pseudonyms rather than their real name?  Legal issues maybe?

Either way, the final game lists P.E. Young and a "Ken-Chan" as composers. I'm going to hazard a guess and say that Ken-Chan created the more Japanese styled music for the July 18 Build, and P.E. Young created the more American styled Rock soundtrack for the subsequent builds.

A few tracks from the Jul 18 build remain in the final, such as the music for the Rita cutscenes, and two of the beta tracks from the Jul 18 build still actually exist in the Final ROM, though they go unused in-game.

This at least would explain Ken-Chan AND P.E. Young getting a credit for music.

Unfortunately, the earliest couple of prototypes didn't have credits yet, so I can't verify it, but that's what it seems like to me at least.