I don't really care if you like Goseiger or not, but calling someone "dumbo" for her looks is a sign of a pretty low self-esteem.
"Poking fun" suggests that the names should be funny. None of them was. That's all I have to say on that matter.

*Drops Mic*

Why make Gosei Knight the sixth ranger? They could've added a new GoseiGreen after Hyde's fallen friend. Anyone from the Seaick tribe.

A more clever nickname for Eri would be "The Cab."
Because she's an angel with a shotgun.

http://m.youtube.com/watch?v=rQKMLmXc0xo

Because that would've been the obvious story path.
"Every tribe has 2 members but water? Obvious 6 member is gonna be water."
So they took a left turn to keep viewers on their toes. That way Magis's death mattered and they still got a badass 6th.

I haven't seen Goseiger (Might get to it eventually if only to see what Megaforce omitted), but I always wondered why officially he's classed as a 6th Ranger rather than Extra/Bangai Hero. His suit looks more Bangai Hero (such as Black Knight) than a traditional 6th Ranger.

Maybe I'm overthinking this, and they tend to fill similar roles in their respective shows anyway.

Most likely because it was much easier to market him as a sixth ranger to kids.

I wish we could have more human-looking villains in the 2016 sentai.

Even though we had Basco, Enter, Escape and Z just recently? Or do you just like human villains?

Yeah but,we just have few of them.