NO! Of course Gokaiger gets screwed over. Why am I not surprised?

Did Gokaiger ever explain that? Or was that just "Green and black are... Um... Hey kids, look at the badass pirates!

It's better than Silver going

• Green
• White/Silver
• Black
• Red
• Gold

It is shown that any Gokaiger can go any colour, so I guess they just went with it.

Actually, there whole reason Green could become Black Rangers was because of the counterpart set up. Green would go to Green, but if there wasn't a Green, he'd be Black.

Example:
Himitsu Sentai Goranger (Each Number Represents the # on the helmet):
GokaiRed- AkaRanger (1)
GokaiBlue- AoRanger (2)
GokaiYellow- KiRanger (3)
GokaiGreen- MidoRanger (5)
GokaiPink- MomoRanger (4)

Goggle V:
GokaiRed- GoggleRed
GokaiBlue- GoggleBlue
GokaiYellow- GoggleYellow
GokaiGreen- GoggleBlack
GokaiPink- GogglePink

And when there wasn't a color counterpart (or if the ranger with the same color was actually a 6th ranger,) they went with number placement.

Ninpuu Sentai Hurricaneger
GokaiRed- HurricaneRed
GokaiBlue- HurricaneBlue
GokaiYellow- HurricaneYellow
GokaiGreen- Kabuto Raiger
GokaiPink- Kuwaga Raiger
GokaiSilver- Shurikenger

Bakuryuu Sentai Abaranger-
GokaiRed- AbaRed
GokaiBlue- AbareBlue
GokaiYellow- AbareYellow
GokaiGreen- AbareBlack
GokaiPink- N/A
GokaiSilver- AbareKiller (due to being the "6th")

However, each one of them could turn into whatever ranger they wanted.

GokaiPink was AbarePink.

I typed that up with official heroes. AbarePink was more of a gag character/joke transformation. After Episode 29, they never showed her using it again.

Ah.
Well, I was thinking that they'd just say, "To the Morphing Grid, Green and Black energy are incredibly similar in makeup, but different enough so that the "Too much Pink energy is dangerous" thing doesn't happen, look at RPM. Oh and Sixth Rangers have their own power frequency."

She still had it, but she never used it, considering it ugly

i hope see navi and katie in pr super megaforce

That's the best explanation i've seen.