Do those 11 players working hard include Mahrez and/or Sane? His work rate isn’t considerably less than either of those and both of them have played for us at anfield.
Even a Messi jogging around the pitch for 90 minutes requires two people to mark him and probably a third to offer cover meaning there’s acres of space somewhere else for Kdb, Sterling, Aguero, Foden etc and in possession against low blocks he can shuffle it to one side and stick it in the corner from anywhere.
Messi’s problem at Barca is it’s all centred around him with nobody else to really worry about for the opposition. Suarez is well past it, Griezmann has been a disaster and dembele can’t get fit backed up with a pedestrian midfield. Stick him in our side and it’s frightening. With the exception of a player exchange unless it was Garcia and a few other expendable players I’d offer Barca whatever they wanted this summer to fund their rebuild. Never going to happen though