At least from what I have seen so far, his performances in the 2010-2011 season were not as consistently fantastic and creative (specially when it comes to genial through balls) when compared to previous seasons. He still had some truly awesome games, specially in the big stage. His performance in the 5-0 against Real was truly fantastic. But overall in the season, it seems that he was playing a lot safer and not trying as many fantastic through balls, happy enough to simply retain possession, like in the game against Malaga in the 4-1 victory in 2011 (I watched the entire first half and part of the second), Iniesta, Messi, Villa and even Pedro, I think, were playing the crucial fantastic through balls while Xavi was happy to just pass sideways in the center of the pitch.
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I looked at whoscored. They do not have stats for 2008-2009 season, but for 2009-2010 season Xavi appears as Barcelona's third best player in La Liga based on average rating of his performances: 7.67. Dani Alves was second and Messi first. He also had an average of one through ball per game and 3.2 key passes per game. And he was also showing great skills, like his fantastic performance against Malaga in Barcelona's 2-1 win. In the 2009-2010 UCL, his performances according to whoscored were crazily fantastic. An average rating of 7.90, the second best in the team. Also 3.7 key passes per game and 1.8 through balls per game. These are insane numbers. Considering that he was injured more in the 2009-2010 season compared to 2008-2009 and how he had less assists, can you imagine how ridiculously impressive all these stats would be for his 2008-2009 season, considering that he had 20 assists in La Liga and 7 in UCL for the 2008-2009 season, while he had "only" 14 assists in La Liga and 4 in UCL in the 2009-2010 season?
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2010-2011 season in whoscored gives him an average of 2.5 key passes per game and 0.8 through balls per game in La Liga. Still good, but not as dominant as before, Messi and Dani Alves were actually quite close to his numbers. I do not remember well now, but Iniesta was close too. When it comes to the average ratings in La Liga based on whoscored again, he was the fourth best player, with a 7.58 average rating. Dani Alves had 3.66 and Iniesta 3.77, the highest average rating in La Liga for Iniesta's whole career by far in the site. In the 2010-2011 UCL's average ratings, Xavi had an average of 7.44 (behind Busquets in UCL and perhaps even more Barcelona players, I do not recall well now), had 2.2 key passes and only 0.4 throughballs per game, far behind Dani Alves, Messi and Iniesta, who had an 1.1 through balls per game. Xavi finished the season 3 assists in UCL and 7 in La Liga, a clear drop in numbers.
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I want to see a version Xavi playing like in these games below, often making great, incisive, fast passes and skills. Aside from the 5-0 against Real Madrid and the 5-1 against Espanyol, I am not getting this level of creativity and constant genius as much as I would expect from a player often praised for his fantastic game's vision, through balls, creativity and the best central midfielder ever, though I still have to watch the vast majority of the games, I confess.
https://youtu.be/55AmsuE2c08
https://youtu.be/ND6PHg74jcA
https://youtu.be/X8AUVftA4L8
https://youtu.be/fXjJLIuuP44
https://youtu.be/S1PBrGRihHU