The Gokaiger did return the Keys, and most every other appearance had them essentially borrowing the Keys. Goseiger used their own, and then Hurricanger took their own back mid-series, they used them then returned them for the Gokaiger to use. Again confirmed in the finale, AkaRanger transformed. Keys can be used, returned, and borrowed.

All I know is that naming one team "the weakest" is going to raise the salt levels of somebody.

I'd personally have to check on all the Power Rangers adapted seasons at the very least to see the major differences, besides Battlizers obviously.

I don't think anyone is gonna be salty if I name Sun Vulcan as the weakest team :lol

If they reuse the Ranger sufix again, they could bring back the Man term too ?

I don't see why not.
I want them to see another team not have either a suffix ending in "ranger," "ger," or "man," though. Like GoGoV, or Goggle V. That would be fun~

Ohranger mechas was that bad ?

I think Crashman would be an interesting team name.

No real idea or concept of what the team would be like or what their theme would be, just got the name so far.

I think vehicles would work, Plane Red, Truck Blue, Car Green, Forklift Yellow, Heli Pink
Huh. That's easier than I thought

Um, no? If you are talking about why Ohranger was considered a failure it had to do with the fact that the 1995 series was about alien robots invading Earth and a military task force fighting back, and in March that same year, a terrorist cult known as Aum Shinrikyo released sarin nerve gas on Japanese subway cars which to the Japanese people was the deadliest attack to happen to their country since America nuked them. Along with the Great Hanshin Earthquake earlier that year, serious gripping alien invasion was not a good tone for the series to have. It would be like New York City's AMC Empire 25 having a Die Hard rescreening in October 2001. What made matters worse was the series was in a bit of a ratings slump since Fiveman so the low ratings just went lower.

The toys of all the weapons and giant robots however sold well enough that Toei was able to greenlight another series for the 20th anniversary, and decided to take the Japanese people's fear and stress of the last year and use the next show as a sort of cultural Iyashikei by making it an off-the-walls stupid parody of everything Super Sentai was, with wacky jokes and goofy scenarios involving characters who were literally using traffic safety lessons to fight off a pangalactic villainous band of bad drivers. And it was EXACTLY what the Japanese needed at the time and ratings and toy sales boomed.

Many people consider the mechas ugly but, they looks pretty cool to me.