When both Xavi & Iniesta start in midfield, it is either Biscuits or Yaya not Keita...And since Pep dislikes Yaya, it'll most probably be Biscuits alongside Xaviesta.
I'm assuming this is sarcasm then?...Keita is obviously a player that Pep wants to get onto the field which I can't disagree with...He definitely adds punch and directness when the offense is stagnant.
If Yaya starts at DM and both Xavi & Iniesta are in the midfield, the only way Pep brings Keita on is likely as a sub for Iniesta or Thierry, I'd imagine
Ideally, Pep, I'm sure, wants both Yaya & Seydou on the pitch at the same time but who do you sit?...I think if Pep is truly going to employ a rotation policy then he needs to sit a player, any player, if they are not adding to the effectiveness of the match...I think that's where Keita could be employed as a super sub
I think many of us were expecting an evolution in Yaya's game this season after some brief teases of it last season (Esp. the CDR Final)