You're right, moving Alexis stemmed the bleeding down our right, but we still looked far more exposed, and that worries me. Torino were making a late push down 2-0, maybe they wanted to take more risks, we wanted to see out the game, all those game-state explanations are perfectly valid and maybe they're right and I'm wrong--and they all go beyond Gila being subbed off.
But as you said: the team slowed down, Musah was slowing down, Jashari ran his ass off (he covered a lot) and even Ramos is tired--therein lies my concern. When the team is exhausted, the shape collapses and we limped through the final 15 minutes: that's my concern. Hopefully we will build our fitness up, rotations will be sufficient to ensure we can maintain this pace, and with Pulisic, Moreira, and others being part of the team, we will be better off.