Alright but where is he gonna play? He's main position is RW and cuts inside onto his left. We have Bernardo and Mahrez there, so if Messi starts every game those two will always be on the bench.
Bernardo's best position is RCM where KDB plays but he's irreplaceable there and Mahrez can only play RW.
Pep won't play Messi as a false 9 coz he can't press unless we play someone from the bottom half.
The pressure will be to play Messi in every game coz how can you have world's supposedly greatest on the bench? Someone will have to be offloaded. Bernardo most likely. No chance Jesus will go coz it's Aguero's last season. Either Mahrez or Bernardo would have to go.
Unless Pep decides to play something like 4-2-4 so we still have two wide wingers (Sterling/Torres and Mahrez/Bernardo on each side and then ST and Messi as a second striker. Or something like 4-3-1-2 with Messi in a no. 10 role behind the two strikers (Jesus/Kun and Sterling) but again Torres, Mahrez and Bernardo all on the bench.