Thing is, Pep hardly uses a massive squad. He sticks to what he knows/likes and has always preferred a smaller squad for harmony given he rarely actually makes dramatic changes.
On Saturday, 4-1 up at home to Ipswich and it did feel a bit of a surprise to see Nunes come on. Why would we go out of our way to sign another player just to use them the same way? Pep has his core players and then 2 or 3 which rotate with minutes in cup games/dead rubbers/at the end of matches to build their understanding of the game.
As long as we have that, we'll be fine. A major benefit to Pep is that a lot of our players can play numerous positions;
Ortega - GK
Ederson - GK (/CM?) ;)
Walker - RB, CB
Lewis - RB, CM
Akanji - CB, RB
Ake - CB, LB
Dias - CB
Stones - CB, RB, CM
Gvardiol - LB, CB
Kovacic - 6, 8
Rodri - 6, 8
Bernie - 6, 8, RW
Gundo - 6, 8, attacking midfield, false 9
Kev - 8, false 9, attacking midfield
Foden - 8, RW, LW, false 9
Grealish - 8(?), LW, RW, false 9(?), attacking midfield
Doku - LW, RW
Savinho - RW, LW
McAtee - LW(?), RW(?), attacking midfield, 8
Bobb - LW, RW, attacking midfield
Haaland - ST
If there are injuries to players, there's always a few who can step into that position and make it their own in the others absence. We've seen it with Savinho already, I can guarantee Bobb was due to start the season at RW until his injury. Foden last season made Kev's position his when the latter got injured. As far back as 2020/21 when Gundo made the false 9 his when Aguero was out.
Akanji's immense performances at RB during 22/23 in the Champions League when Walker was out/not preferred. Likewise Stones. Gundo's performances in 18/19 when Fernandinho was out. Kovacic away at Chelsea this season with Rodri out. Grealish struggled with form last season, Doku comes in and cements the LW position.
It might not look like there's much depth across the squad on paper but when you factor in versatility, it's actually quite stacked. It's a testament to Pep's coaching ability, Txiki's ability to find the right player and the players themselves for being so good.