Basically, it's hard to be a defensive midfielder when you're stuck trying to cover multiple unchecked runners coming into that space in front of the defenders. Tuiloma looked poor but I don't think you can write him off in the role just yet given the circumstances.
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His job was in front of the back two. If you need help, you communicate and marshall others around you or you get up Reids ass or Hudsons ass saying you need help and get them on the case. He might be 19 but he is an international footballer. If he can't do that, then send him back to develop more at club level. The AWs is not a place to develop players to do basic facets of football.
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That being said, I am picking on him a little and realise that others were not as good. I just thought he was a hell of a lot worse than others. Had he performed like a DM should have, would the result been have been any different? I don't believe so because they played well and were allowed to play well. We would have looked better and had better shape and more time on the ball to at least be able to look to forge a structured attack.