If Guardiola wants a team that fights and has balls then he needs, and we need, KOMPANY & ZABALETA on the pitch playing!!
With Kompany everyone will hold their breath after every tackle. Knowing him, he'll want to go in for everything to make up for his absence or prove his worth. If he gets injured, the mental hit the team will take will be massive. A wasted sub as well. Then if his replacement doesn't play as good, he'll be slated. This is all hypothetically speaking.
Zaba isn't as quick anymore but offers more going forward. Sagna still has some pace but offers little going forward. His back passes tend to put him trouble as he often looks uncomfortable in possession and the worst person to capitalise on mistakes is Hazard. Tough choice for Pep. I can understand Navas at RB. Probably as a measure for Sanchez. However, he's not a defender. I definitely don't envy Pep.