Picking up starting line up is like a roulette for some here. Actually coach should not gamble with that, because players care. Pep is going with reasonable continuity, otherwise what would Lewis, Doku or Kovacic think? Moreover to build a good form you do not rotate at this stage half the team between Brentford and Inter. Quite the opposite. You want to build best fitness by playing mostly same players. A bit of rotation yes, but not too much.
Yes, we have few players that are nailed down starters, almost instantly when they come back. Haaland, KDB, Rodri - yes. Im not sure Foden is amongst them. Hes been magnificent last season, but euro and a bit of lack of full preparations concerns me.