The Ox is going to need to be pretty productive going forward if he insists on giving the ball away at such crucial times regularly. He doesn't have Wenger's total trust yet, though neither does Theo. Ramsey is notflawless but he had a season where he pretty much had the best defensive stats in the league as well as attacking so he earned a level of trust from the manager back then.
Gabriel is good but he could have given a pen away and will next time if he isn't careful and as much as I appreciate the cynicism, I thought his yellow was unnecessary. Harry the opposition but release him before the ref looks at you and sees a clear foul!