Well, they are basically a glorified Super Sentai Parody (you'd know them as Power Rangers), given they have Sentai in the title. Why not have a team insert song to play, when all those old Ranger teams got them? Goes with the poses nicely.
I think they should just be hired guns in that case. Basically a third party that works for the highest bidder like they did with Ledgic. But frankly the Ginyu squad dynamic wouldn't really work very well outside their arc.
