Rebel/Cool Guy (Male)
Strong Guy (Male)
Kid Genius (Male)
and more recently the "6th" member usually an evil or rogue hero turned good (Male)
Yeah if anything Power Rangers is keeping this more alive than Sentai is.
How many Sentai have you seen?
Because none of the ones I've seen follow that pattern
Now that DOES sound like what I've heard Dairanger is like, but the 6th member usually isn't from a villian organization.
Also the 6th member usually isn't a villian at first, though it is typical for him to come in and annoy the unholy hell out of the team.