O'Brien's effort came in his 12th straight match, the longest streak of senior games in the same season in his career to date.
"One of the big things that was challenging for Tim is that last year he could be forward, back and ruck all in the same game he was never able to settle," O'Brien's agent Tim Lawrence, of Stride Sports, told AFL.com.au.
"But it is what it is. It's just the nature of the industry and there's no angst towards anyone. It's nice he's more settled now. He's forward again and I tend to think that's more his spot."