I think the last week has taught Pep a couple of lessons.
1. Not suggesting Pep thought this but... you're never too clever to learn new things?
2. The EPL is a tough harsh environment and no matter who your opposition is, the first thing to do is to go out to win the game from the start. Always, without fail start your strongest eleven, then take the big guns off - the league is too harsh and unforgiving to field a weakened eleven with a view to bringing out the big guns to recover the situation if necessary - sadly it's not like that in the EPL.
Strongest first eleven please Pep. If they're fit enough for the bench then they're fit enough to start.