So, in the end, I couldn't even keep my own word. I increased the cast size to 21 since I had difficulties cutting down the shortlist to the final cast. Here is the final cast of 21 All-Stars from all 6 seasons.
Matedog1209 I considered (and actually had) Anthony and Dana from season 1 on the cast at some point, but then I realized they were both multiple days inactive and I thought it would be unfair to include them over others. I would have added Shay but I was really tight on female spots.