To know Pep didn't play "the best players", you will obviously have insight into who was fully fit, who had niggles who was recovering from injury and needed time management, how training during the week went, what the strategy was, what was the objectives for the game, what the priorities were etc etc, so please Marv, put us out of our misery and tell us and then all those challenging you will say, "you know what, Marv was spot on" and aren't we blessed with someone on the inside posting on here.
You are (appearing to) be basing your argument on a single game, not a bigger picture - that is why pep manages at the club and why you manage on your keyboard (that wasn't meant to be ridiculing you btw).