Iwobi now playing his 7th game, 6 of which are starts, this month. 5 games of which 4 were starts last month. He's a kid in his first full season and Wenger is failing to protect him in the slightest. Last player that got played this heavily at that kind of ages was Wilshere. Refuses to rotate properly and when he does... he doesn't rest the right players.
This game is only Bellerin's 5th game this month though he's never subbed. Just have a nasty feeling Iwobi will end up suffering a massive injury due to overplaying/tiredness at some point and Wenger refusing to rest him will be the reason for it.