
Aidan wrote:
Cineax actually list what they consider the main cast on their webpage.
They didn't even have that list before season 6 https://web.archive.org/web/20160503174424/http://www.cinemax.com/strike-back/ :)
Anyway, it's not rare when the show's website or the press releases does not fully correlate with the on-screen credits. But on-screen have the highest priority.
The good example would be Laurence Fishburne in black-ish. He is listed among main cast both at the show's webpage and in episodic press releases, but actually on-screen he's credited as a special guest star.