The sheer number of uninspired draws Pogba has turned into wins with his brilliance makes this argument no-contest really at this point.
Now if Marchisio were to play a starring role against Monaco, and turn in two performances like yesterday, perhaps that would turn the argument around a little, but more so because Pogba is out injured and does not have the chance to shine himself.
And Pogba has been nowhere near as inconsistent as people are making him out to be. He's rarely had a match where he doesn't either turn up eventually with brilliant offensive contributions, or if that isn't happen, with a dominant display of tackling and ball-winning in the midfield.