All-purpose yards are meaningless if you're the team's kick and punt returner. He was an ok returner, but didn't take any to the house. 160 Rushing and recieving yards are impressive, just not amazing. He was the best RB in the wildcard week, but not THAT great.
What do the all-purpose yards contribute, let's say you take 3 kickoff returns and 3 punt returns. You return kicks for an avg of 20.0 yards, and punts for 5.0 yards. You already have 75 all-purpose yards from sub-par performances.
Edit: I just rechecked his stats, and I have to say that's he did a great job punt returning. But I still don't think it was anything more than a great performance. It's not like it's the best performance by an RB in the whole season.