Based on your pictures, I don't see anyone who dissappeared. The cutoff for the later date is 27, and everyone from the first picture with at least 27 wins is still there. My guess is the people who were close to 27 stopped playing. I've only been playing like 5 days, and the guy in 1st had 50 wins the first day. Third day I caught him at 70, and after I passed him, it's like he quit. I'm almost at 200 now, and he's at 75, so he's played a whole 5 matches in the past 3 days after he got 70 in 2 days. Burnt out I guess.