2 goals. Walker would have stepped up and tackled Vinicius after Mahrez's chickened out of the 50/50, and he's not getting done by Vinicius like Fernandinho.
Personally I think you're barking up the wrong tree with Ederson's passing. It causes trouble because they were committing 7 or 8 players to the press, but that's also why when we did pass out, we were pretty much through on goal instantly. That's the risk vs. reward Pep's always bought into and we know Madrid are great at pressing because that's how they got here - forcing silly mistakes from Donnarumma and Mendy who both gifted Madrid goals directly.
Like with some Liverpool games, you've got to accept some hairy moments passing out of the back because the whole point is to draw players into pressing and then get it past them.
I thought the biggest problem there was Stones not being fit from minute 1 anyway, he gave the ball away a lot after receiving the ball from Ederson, but that's not necessarily Eddie's fault.