You keep saying he defended well. I thought he was okay, but nothing to get excited about. He had no direct opponent with Liverpool not playing wingers, made three tackles, committed two fouls, lost the only defensive header he attempted, and didn't make any interceptions. No big mistakes, either, which is nice, but it's not like he was a dominant force in the defensive half to make up for his lack of attacking.
And, no, we didn't need him to defend. He was playing fullback against a team with no wide midfielders. We needed him to push forward and make overlapping runs past our right winger. That's how you win against a team playing three at the back.