The things that concern me about facing Pittsburgh:
1) The "vow" to earn a rematch in the playoffs after a pissed off week one loss that coincidentally, started off the NFL season. They likely would come in pumped up, and that concerns me a la 2009 Ravens, 2010 Jets, and 2012 Ravens. All of those teams got hot at the right time and had some swagger to them, and I think Pittsburgh fits into this category perfectly.
2) The fact that their defense has held the opposition to 20 or below in 8/11 contests removing their two bad games (victory over Oakland 38-35, loss at Seattle 39-30), and is basically giving up the same PPG average as we are (half point per game difference). This tends to give them the best balance out of DEN, CIN, etc--as they are both a top 5 offense and a top 10 defense.
3) The return of Bryant, and the addition of Wheaton (201 yards receiving a couple of weeks ago) to their WR corps. Add in the always reliable TE Heath Miller, and that gives you 4 very capable receiving options. I don't see any other team which poses such a threat.
4) The fact that neither team in this matchup has won during the regular season, then gone on to win again in the postseason rematch. While it's got to be a limited sample size, it's something that gets brought up when these two teams are set to face off, so it's worth noting.
5) Our injury losses and lack of a running game tend to even things out a bit. Losing Lewis from week one is the biggest loss, hands down, and it changes our offense a lot in my opinion. Yes, we're definitely still very potent and that isn't up for debate, but the running game needs to get going and soon.
6) Their fan base is loving the idea of returning the favor by winning in Foxborough, just as we've done in Pittsburgh a couple of times during the month of January.
The things that make me rather confident about facing Pittsburgh:
1) Brady/Belichick have done historically well vs. this team.
2) Much like almost any team, they can be susceptible to the short, quick timing passing game. The return of Edelman is crucial to this factor.
3) Butler would be seeing Brown for a second time, after building some additional confidence throughout the season. Hopefully, this would lead to an improvement in his assignment, even if that means allowing Ryan + safety help on Brown, and covering Martavius Bryant, which is what I think would happen.
4) We'd be at home. That always helps.