It makes sense to play Thiago ahead of Xavi. Firstly because he is the one who'll replace Xavi and also because Xavi was injured. Fabregas only looked poor because he was played out of position, early in the season when he was in midfield he gave crucial goals/assists and great performances. Without him our record best ever start wouldn't have been possible.
First of all, I never doubted Cesc's importance in the first half of the season and this is clearly stated in my post. Secondly, probably you don't remember very well, because Cesc played out of position only after Messi's injury. He was awful when playing as CM as well. He seemed extremely slow, not only in his feet, but in his thought processing as well, his first touch reminded me Arbeloa and it doesn't make a difference if he played as a CM or as a false 9 for these attributes.
We all know here that Cesc can be an amazing player, but he was playing extremely poor, while Thiago was collecting
left and right. It was an unfair treatment towards Thiago and there were many of us to note it back then.
Everyone that has been a part of a football team, knows that managers have favorite players or some players that get preferential treatment. I am only speculating now, but it is not impossible to think that Thiago maybe felt this way, as he clearly outperformed Cesc, he still could not play his minutes.
And I will say it again, because your Cesc love make you think illogically, Cesc was in better form for the first part of the season and he rightly played. Imagine now, if Thiago played instead of him despite his first half of the season form. I guess Cesc wouldn't be happy either.