Could you not play it with both centre halfs (Stones and Gvardiol) pushing up into midfield with Ederson taking the space left by then. Ake and Walker wide. Rodri then becomes the spare Gundo replacement (assist and a goal on Friday already showing he's more of a threat than Kova) and we then have 6 in attack and not 5. The box 4 becomes a diamond shape as Rodri advances but with Stones and Gvardiol you have two great players who can pass from deep in that really squeezed space and we have loads of runners attacking the half spaces in the oppo box? Unfortunately would mean no Dias :(
Or you could keep Stones at right back and Gvardiol at left back (Ake and Dias push wide with Ederson pushing up). They both invert - Stones makes the box 4 and Gvardiol becomes spare and moves up and down causing chaos, breaking lines and becoming Cancelo 2.0
Either way you end up with the spare man attacking. It's really vulnerable to overloads in the wide positions but to do that the opposition will need go leave even more space for us to attack. Walker, Dias, Ake are all good one on one defenders though whichever combo of the three you play. Although Pep's probably playing Akanji anyway