> but Carlsen seemed to have more of a clear edge several times (blundering it a bit in games 1, and slightly misplaying similar edges in games 9 and 10) before gaining an absolutely vicious one in game 12.

This doesn't show every game, but fivethirtyeight.com shows the games being pretty split up to game 9:

https://fivethirtyeight.com/features/it-was-finally-fabiano-...

With Carlsen having a strong advantage in game 1, and Caruana in game 6. Caruana having a small advantage in game 2, and Carlsen having a small advantage in game 9. It seems about as split as it could be.