Was thinking yesterday - I really do believe he's been groomed to become a big game player. When you think of a young player coming through, you expect starts against relegaton fodder, 30-40 minutes off the bench against midtable teams at home, etc. to ease him in. Phil wasn't getting those sorts of minutes.. fans and media were losing their heads over it... But it's as if Pep knew he could handle those games comfortably; he didn't need to prove that to him, and playing him in those games would've just put too much attention on him at a young age.
So instead... he played him in tougher games where he didn't need to look incredible - he just needed to do well enough for the team to win. As opposed to playing him against a team like Watford, for example, getting everyone excited by some incredible performance, and then throwing him into a massive game where he doesn't play as well, and watching the pressure mount onto him as unrealistic expectations aren't met.
If you go back and look at how he was introduced into the XI.... His first league start was against relegated Cardiff (H) - fine, get the first PL start of the way - and then straight after that? Spurs and Leicester during the final month of the most intense title race in PL history. Then no league starts again until December of the following season - Arsenal away, and then Everton. Then the cup final at Wembley, and the derby at Old Trafford. He didn't start against bottom half opposition until Project Restart, when it was clear that 1.) his inevitabely great performances against those weaker teams could be replicated against better teams, and 2.) David wasn't fully up to it anymore, meaning Phil was actually needed.
I trust him to deliver in the biggest games more than basically any other player we've got, which is incredible for someone his age.