There's a reason why Marchisio was playing out of position, he wasn't good enough to take the CM-spot.
You do realise that this can go both ways, right?
Marchisio was played out of position because, out of those 3 players, he was the only one remotely capable.
Marchisio was played out of position because, out of those 3 players, he was the worst option for CM.
And it's nothing more than a guessing game anyway between the so called haters & the fanboys. We'll never know.
The only thing we do know is that, so far, 2 out of those 3 players were deemed unnecessary/not good enought for Juve. And they subsequently had to leave.