Nobody that has played the last 10 seasons that hasn't already returned is worthy of returning OR will return if asked
BB8: Who? Eric and Jessica maybe?
BB9: Not a single person
BB10: Keesha is the only one I can see returning
BB11: Michele wouldn't, Kevin might
BB12: Perhaps Matt and Ragan?
BB13: Kalia or Porsche would be a disappointment, as would Adam
BB14: Ian might, Danielle likely another disappointment
BB15: McCrae or Elissa perhaps
BB16: Frankie(ugh), Caleb(ugh), and Donny/Nicole(only tolerable ones)
BB17: Shelli and James for sure, maybe Becky. I'd hope to see Vanessa or John return and play different