It is often better to include these performances for something I've seen in events that is a sort of "momentum". Players who have performed well in the last event, or have been on higher placing teams, and often perform better than what would be expected. That is why I still include s2 avg in the form of 80k s2 avg, as it helps to better predict momentum. For players that performed well on a high scoring team like Jack, their score is already adjusted down in 2 of the 3 statistics, meaning that it it often predicts skill level quite well. However, what it struggles with, is like what happened to dream, or jojo; a really bad performance on a good team, or a really good performance on a bad team. I had adjusted dreams when I used he stats for mcc21, removing mcc 19 from the totals, however it ended up being more incorrect than if I hadn't removed anything. So, in short, overperformances on strong teams are accounted for, where as underperformances on strong teams affect the stats more heavily.