Lots of factors.
1. Henry never got going in the playoff game and the ravens got behind. Game script was advantage bills. Once Henry has a couple big runs it gets harder.
2. Lots of new people on this defense and it was game one. Ogunjobi, Hoecht Hairston and White were not available.
3. The ravens have one of the best offenses ever assembled where the addition of Henry to what Lamar does is lethal. Their EPA/ DVOA. numbers are historic
4. Zay flowers did not play in the playoffs
5. We won anyways!