Which season's cast had the most success in later seasons?

Hope this question makes sense, and I'm trying to figure it out and I know guys know way more then me. Cook islands had Parv return and win, Ozzy came back multiple times and did well as did Candice. 28 had 2 winners Sarah in GC and Tony in WAW, plus spencer, woo, and choas came back. 18 had Tyson return and win, coach later made a FTC. Which season do you think had the most successful cast?

Edit: Obviously returnee seasons like HvV wouldn't count.