There is a big issue that is causing De Bruyne to try and do too much. David worked as his foil, as well as a link up for the whole of the left side and as much as we wished that would be taken over by Bernardo and Foden, it's not going to happen over night, if it will at all.
The bigger problem is control of transitions, awareness from a single person to control the traffic. That position is owned, in all of Pep's teams, by the 6, that one person needs to be VERY disciplined and aware of everything. I think Rodri is quite disciplined and his awareness is quite decent, but that small drop in level between Fernandinho and Rodri in the grand scale of the team, is huge. Gundogan managed to understand that position better, you can see when he plays there he not only knows where to move, but where to get others to move as well, and on the transitions the other way he knows where he and others need to be. The way we are losing games is mostly half spaces in midfield that were plugged up before, and then that allows time to get in behind which Pep knows is our biggest weakness.
Blaming Ederson for his positioning there is wrong IMO. That's the job he's asked to play and its saved us a lot, he needs to protect not only his goal, but the huge space between him and the whole back 4.