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If you compare Pep Guardiola and Xavi in the context of Barcelona, luck is more on Pep side. Because during his coaching period, Barcelona did not experience debt of this size and Pep still had Iniesta, Messi and of course Xavi himself on the field. With the balance of finances and the depth of the squad he has, Pep can bring Barca to the top of glory, but Xavi is facing the opposite situation. Overall football-savvy observers and commentators certainly appreciate Xavi performance, and hope he can be as lucky as Pep one day.
On the other hand, the proof of Xavi genius is the La Liga trophy last season. I don't think there are many coaches who can deal with transition situations and win trophies at the same time.
Pep Guardiola inherited the perfect squad when he handled Barcelona, the club's condition was quite stable from a financial point of view. Meanwhile Xavi inherited a squad that was in a slump and was exacerbated by Barcelona's financial condition which was in shambles. The squad balance inherited by Guardiola makes it easier to manage the team and can bring in the players they want easily due to the availability of funds owned by the club.
The difference in the conditions of the clubs inherited from these two coaches made Guardiola a little luckier than Xavi, but Xavi deserves appreciation with his intelligence being able to present the La Liga trophy and the Spanish Super Cup even though he is equipped with a squad that is not as luxurious as that of Guardiola.