toei make up sentai themes like battle fever j , denjiman , zyuranger , dairanger

oh, you mean countries (battle fever j), dinosaurs (zyuranger), chinese mythology (dairanger), and.... what the heck was denjiman supposed to be...

5 people are denjistar 's desecents - ic choose 5 people come denjiman

Denjiman's themes are being the first alien Sentai and having electric powers. Not that you can tell by looking at the suits.

it's possible that saban didnt want use the pirate theme because of us standards or just make it more original. it could be both.

in the era of spongebob theres no reason why the pirate theme wouldnt work and in fact should excel.

Ok, but in terms of visuals they did. There was nothing angelic about Gosei Great, or the individual mechs. Gokai-Oh uses a pirate ship as it's main component. The helmets kind of have pirate hat sculpting on it. Gokai-Oh wears a giant pirate hat.

They copied Samurai almost exactly from Shinkenger....there is something that wouldn't have much relevance to an American culture. Pirates on the other hand, is much different. Kids are very familiar with what Pirates are. Kinda odd they are seem to opting out of using that theme honestly. I mean there is a kids show on Disney Channel right now called "Jake and the Neverland Pirates." Not to mention the 4 Pirates of the Caribbean movies, with a 5th on the way. If Saban doesn't use the theme in the show it will be because they don't want too, not because American culture won't understand it.

To be fair, they pretty much completely obliterated the actual Japanese culture that was in Shinkenger, beyond them living in a Japanese style home and calling themselves Samurai and using Kanji (although they never pointed out it was Japanese writing).

Kids know that Samurai are cool people with swords from Japan that are into honour and stuff, which is all Power Rangers Samurai displayed.

To be fair though...so did Shinkenger, it was very Japanese but only really very Japanese as according to an American audience who has discovered Japan through anime, I can think of very few aspects of Shinkenger that were uniquely Japanese and something only a person with an understanding of Japanese culture would include.