Looking at Net Points, the Titans are up 113 and the Giants are up 122. Nobody else even comes close.
Yesterday, the Titans were playing with a 3rd string CB on one side for most of the game and some 2nd and 3rd string defensive linemen and didn't miss a beat. That's what's been impressive so far about them, is that even the unheralded players are stepping up and playing well. They may not have as much starting talent as some other teams (the Giants come to mind), but their second and third teamers fill in well when needed.
There are going to be some tough games for the Titans to close out the season (Jets, Steelers, Colts), but there will also be some (on paper) fairly easy ones (Lions, Browns, Texans). If they can "hold serve" on the easy ones and win just one of the three difficult ones, or beat the Jets and Steelers (both home games for them, by the way) and one other (or some combination of losses for those teams), they have home field locked up.
I'm a Titans fan, but never expected the team to do this well this early. They aren't going to win pretty and blow people out, but I think they have what it takes to win it all (and so do about 5-6 other teams at this point). Still, anything can happen, any given Sunday, yada yada yada...
I think the AFC East is going to be an interesting division to watch the next 6 weeks. If Buffalo wins tonight, the Jets would be 7-3 and everyone else in the division, including the "mighty" Patriots and "lowly" Dolphins, would all be tied at 6-4.