There must be hundreds of teams that have been 6-3 in that time frame. I don't think it means much.
We have some major injury and execution issues to deal with. I don't think the Colts are much better than us in reality, but I still don't know if we can beat the Chargers or Broncos. They would stuff the run and kill Brady if we played them today.
As a fan, I will be very disappointed if we fall out of the playoffs. As a realist, I don't think our chances are outstanding at this point. If we are healthy going into the playoffs on the D-Line, at safety and cornerback, on the O-line, and if Brady doesn't get injuried again due to lack of protection, than our chances will be okay as long as our WRs are playing a lot better than now, by getting seperation and running routes correctly and reading blitzes correctly. Also, our running game needs to be sorted out, with new blocking schemes that actually work. Also, it would help to actually be competitive against a team with a winning record.
All those things are possible, and Belichick has a history of making things happen, but realistically we aren't beating good teams currently, and have been badly exposed these last two weeks. So I am going to adopt a wait and see attitude rather than worry about how many 6-3 teams in NFL history won the superbowl.
I realize that an objective attitude doesn't sell well at this site, but I'm gonna wait and see what develops.