7 defenders - Gvardiol, Ake, Akanji, Stones, Dias, Lewis, Walker
Two of those often have injury issues, one of those was clearly looking past his best and another is young and not one we should have been relying on so your point still remains.
However, Arsenal and Liverpool might have an extra one on paper but they're generally reliant on younger players or unproven players within that count. There's no reason Simpson-Pusey can't come in and do a job on Saturday, particularly next to Dias. Liverpool have had to use Gomez and Quansah who are a considerable drop to their usual options.
Our defence would cope a lot better if we defend well ahead of them and don't give the ball away or play suicide passes as we've seen consistently in recent games - even with Gundo and De Bruyne on Wednesday.