[Vodka Drinka]

Well I've watched every series, so I feel I can comment on all of them. I do mostly agree with the O.P's assertions however.

BB1
Stars: Nick, Mel, Craig
Supporting Characters: Darren, Anna, Caroline

BB2
Stars; Brian, Helen, Naridner
Supporting Characters: Paul, Bubble, Stuart, Amma, Penny

BB3
Stars: Jade, Alex, Kate
Supporting Characters: Adele, Johnny, P.J, Spencer

BB4 (Oh dear lol)
Stars: Cameron, Jon Tickle
Supporting Characters: Federico, Steph, Ray

BB5
Stars: Nadia, Victor, Jason, Michelle
Supporting Characters: Stu, Dan, Shell, Emma

BB6
Stars: Makosi, Craig, Anthony, Science, Derek
Supporting Characters: Kemal, Maxwell, Saskia

BB7
Stars: Pete, Nikki, Aisleyne, Glynn, Grace
Supporting Characters: Lea, Richard, Sezer, Lisa, Shabaz

BB8
Stars: Chanelle, Ziggy, Charley, Brian
Supporting Characters: Carole, Samanda, Liam

BB9
Stars: Rex, Luke, Rebecca, Katreya, Darnell
Supporting Characters: Jennifer, Lisa, Mario, Rachel, Sylvia

BB10
Stars: Freddie, Marcus, Noirin, Bea
Supporting Characters: Siavash, Lisa, Karly, Sophie

BB11
Stars: Sam, Ben, Corin, John James and Josie
Supporting Characters: Dave, Shabby, Caiomhe Sunshine, Rachael (had Shabby and Caiomhe not walked they'd have been main characters)