Yes, so I don't count games that I don't see a lean in. That would be why someone from the outside of a clan war would estimate something lower than the total score, just like I would assume any prediction from inside, would also not actually have a good gauge on 100% of the games.
As they stand, the ones that are leaning one way or another, it looked to me like ATL was 20 and ICON had 21. These counts are based on leans/locks from what I can see. Not a declarative number or attempting to predict an end game score.
So far all I've heard from people in the war is that the game count is 49, and that ICON could count 22 as wins. One of which I already knew, the other I was pretty close in my estimate

Perhaps I'll just pm someone from ATL to get a real answer XD