Josephine is without a doubt the last Knight.
Discard is good and all, but I think the trashing Knight is often the best, especially on boards with no other cursing, and especially on boards with junking attacks. Today, I would probably rate that #1. Molly can be critical for the actions and be able to play more knights. Bailey can always be played, so it deserves to be in the top 5. I would probably put Vander and Josephine in the bottom 2. Martin is often not great, but he costs $4 and if you can get an engine going and he is the only form of +Buy, he can make a huge difference. Natalie, Anna, and Martin contribute the most to engine building. So, maybe they deserve the top 3 spots, but then again, how often is a strong engine viable in a knights game. Not always. Then, I would put discard at 4, Destry at 5, and Bailey at 6 Sylvia would be 7, but the coin is pretty nice to have.