I'd rather we sold Cesc than Thiago but we are where we are and Cesc is apparently more determined to succeed here. I think that's something we should respect.
Xavi, Iniesta, Cesc, Roberto.. We are more than set in midfield for next season
Xavi has shown signs of great fatigue last season which resulted in his worse season over a course of 5 or 6 seasons...
We should also remember that Iniesta is injury-prone. There is a risk of him losing several games, so we at least should not overburn him..
Cesc has demonstrated his inability to play the deep position of Xavi or Iniesta..
Given all three factors, i dont see how we are set.. In fact, we are anything but set, unless we think that Roberto can be thrown into the lions and perform like Xavi-Iniesta, something Cesc and Thiago have not managed so far..
IMO, we need at least one reliable solution, perferably Xavi-like, like Gundoghan.. We dont need to wait for next summer, when Fabregas will be sold, bcz a semi-final or quarter final CL versus Bayern or Chelsea might occur with one of Xavi-Iniesta facing problem and the manager puzzled on how to solve the unsolvable..