Or maybe, just maybe, Pep is doing exactly what he promised he would do the very first time Stones came back in the side and not dropping someone until they make a mistake?
There is an issue in the squad of lacking personal responsibility for mistakes and fuck ups which effect everyone else's season, and career. It's partly because we always say, and Pep always says the system is king. It's the #1. A problem that seems to have come from that is the system takes responsibility when people make the same old mistake again and again.
Whether it's Aguero or Sterling missing big chances or Laporte fucking up at the back, somehow these players need to start delivering under serious pressure and as far as I can tell, what Pep is doing is putting on that pressure.
You fuck up? Enjoy the bench for the next month, someone else can and will do your job.
When Laporte comes back in the side he knows that any mistake he makes and he's back on the bench watching. And if he can't cope with that he can't take us to the CL. If he can, then in April he'll be ready instead of melting again.