To be honest, Thiago has a point WITH those stats. Look at the decline of Thiago compared to last season and compare that decline to the gradual and steady rise of Iniesta. The fact he played 2900 minutes last year and 1900 this year would make me a bit mad too, if I were in his shoes. Still, would love for him to stick around and become a regular starter here. But please don't say those numbers are all in favor of Thiago, because some don't.
It has to be seen i a greater context though. In the case of Iniesta he gain over Thiago in subs but his starting 11 and completed matches if faar below Thiago at 20. Thiago last season Started 20 league games and completed 15, Iniesta by comparison at the same age started 12 and completed 10, he was however subbed a lot more. This season Thiago lost 2 months and 12 matches through injury, had he not been away his stats would have been comparable to last season. The thing is FC Barcelona as a club has always been very conservative with giving young players continuity, Xavi and Messi are anomalies in the clubs history, and in the case of Bojan, well we know how that ended.
The thing is Thiago has very little to complain about, he is geting his chances but this is not a charity club were you get to play because you are young and promising, you have to be better than the others on training and then in matches. He has been a bit unlucky with Xavi and Iniesta avoiding injury these years but any time and more likely than not in the near future one of the two will suffer a longer injury and then he will get his chance with a longer streak of full games.
Iniesta didn't get into the starting 11 until Van Bommel was sold in the summer of 2006. Before that he was mostly used as a sub, in fact, Inista is the club record holder in games as a sub, he had to fight hard for his place and never whined about it, Thiago should follow his example. Iniestas 2005/06 season he started 14 games compared to Thiagos 15 this season (both aged 21), so Thiago started one more match despite being away 2 months through injury.