Are the top 3 really the top 3?

There are three undeafeted teams left in the NFL.  The Buffalo Bills, The Tennessee Titans, and The New York Giants.  On the schedules, only one of the games has actually been with at least a .500 team, the Giants the only team to beat someone with a winning record so far.  But does that make the accomplishments of these three teams any less? Last year at this time Buffalo was 1-4, Tennessee was 3-1, and New York was 2-2.

Consider this years stats.  Buffalo is 4-0, their defeated opponents have a combined 4-11 schedule, and they have outscored their opponents 109-63 (+46).

Tennessee is 4-0, their defeated opponents have a combined 3-12 schedule, and have outscored their opponents 102-46 (+56).

The defending Giants are 3-0 (bye week), whose oppenents are 3-9, and have outscored their opponents 83-43 (+40).

I think it is safe to say, that all three of these teams have earned their spots atop their respective division, and will continue to spend time at the top.  I feel the Giants and Titans are better than the Bills overall, but all three are taking advantage of weaknesses in the league mandated schedule and exploiting those weaknesses.