DonAK, hadn't Cruijffista chessmaster Setien also had similar ideas when he came?
You need to earn the respect of the dressing room first and foremost. You remember the personality of Puyol and how respectful he was to coaches, teammates, opposition... the definition of a true captain. In demolition games, during goal celebrations he would mostly go there to celebrate a bit and end the party. I noticed that he even did that during the historic 2-6 at Bernabeu in 2009. If Setien had such a captain to channel the respect for the coach things would have been different, but Messi couldn't care less, there was a pandemic break and given Setien inferior status compared to even Rakitic things were very clear right from the start. In my mind Setien landed the job due to Busi's praise for the man that got the attention. Nowadays captains are Busi and Pique, who have to lead by example. Pique celebrates every goal like some donkey and would give his kidney for a 5-0 win on Real Madrid, he's that controversial and cocky.
Xavi is a Barca legend, by far the best midfielder in club history. He has a clear philosophy on football and I can't even imagine him tolerating some punk ass attitude in the locker room by anybody. I expect some players to leave this winter because Xavi said so. Have my eyes on Dembele especially.