Damn, I think it may be too hard to repeat. Too many factors going against the Ravens.
Such as? Sure losing Pitta sucks but they still have Dickson(also playing in a contract year) and they signed Vischancoe. Next man up. It's the NFL. Injuries happen. Lock the Ravens in to win at least another 10-11 wins and compete for the AFC title. Could care less about homefield advantage because the Ravens have proven that they're road warriors. They're built for the road. Just qualify for the tournament. The defense is looking excellent in camp, especially along the D-line. Suggs has also looked great and Ladarius Webb is coming back.
The only concern I have is the WR position. I hate that the Ravens expect Jacoby Jones to be a #2 receiver. He is NOT a #2 receiver in the NFL. Just ask the Texans. Keep him where he excels, In the slot and on special teams. That being said, sign another veteran WR. There's quite a few available.
Repeating as champs is hard. No team has done it since the Patriots in 2004. But that doesn't mean that the Ravens won't be in the thick of it.