Bench pedro and play who exactly? Alexis?, He was very horrible in the first half of the season, I don't have to remind you of that, But he kicked it up in the second half and not coincidentally, Pedro started seeing the bench more.
The reason thiago played more last season, Apart from the fact he actually played better, Is because he didn't have fabregas to compete against in the midfield, This was our most used line-up:
Alves-Masch-Puyol-Adriano
----Xavi-Busi-Thiago------
--Alexis-Messi-Fabregas---
As you can see, Fabregas was mostly used a left winger, And in times where iniesta or xavi couldn't play, Pep only had thiago to cover for them, And iniesta isn't in here because he had 2 injuries last season one of them was long, And hence thiago covered for him, And the same applies with xavi.
You can go back a few months in this thread, And read the comments, You'll most likely see my comment and from many others, Criticizing thiago's underwhelming performances this season, And the fact he's been average most of the games, With only the getafe game early in the season is worthy of something, And remained anonymous, Until the zaragoza match a while ago, So yes, It's no shock he hasn't played as much as last season, Due to the fact this year he hasn't been the same since his long injury in the summer, And he has fabregas now as a rival.
And i don't know where you came up with that youngsters thing:
Montoya: Last season, 3(4) appearances in first eleven/substitute
This season 10(4)!
Tello: Last season 3(12)
This season 12(10) !!