With no single performance in Week 4 standing out, lets dig deeper into the new, improved QBR?and see who has the largest difference between their raw QBR and the opponent-adjusted figure.Biggest rank changeDropping four spots from number 10 down to 14, Sam Bradford is the only qualified quarterback to fall as many as four places last week. His QBR numbers are fairly similar (65.2 adjusted and 67.9 raw), but he lands in a crowded spot on the leaderboard when we take the opposition into account -- behind Matthew Stafford (65.8 adjusted), Tyrod Taylor (65.6) and Jameis Winston (65.5). Bradfords had the fortune of playing against Green Bay (26th), Carolina (29th) and the Giants (17th), all of whom rank in the bottom half in the league in adjusted QBR allowed.Bradford does have some tough games ahead in his former team, Philadelphia, which currently leads the league in adjusted QBR allowed, and Houston, which has allowed the third-lowest adjusted QBR. But those contests are juxtaposed with four easy division games for the Vikings against division rivals Chicago (31st) and Detroit (32nd) -- two meetings vs. each.Biggest change in QBROf the quarterbacks to make at least three starts through four weeks, Philip Rivers has the largest difference between his adjusted and raw QBR values. He moves only one spot in the rankings (drops from 6 to 7), but his raw QBR of 74.2 adjusts all the way down to 68.4. Rivers did post a fairly impressive 72.9 raw QBR against New Orleans on Sunday, but the problem is that a 72.9 raw QBR against New Orleans is actually fairly unimpressive. Since the start of the 2015 season, it is only the 16th -best raw QBR New Orleans has allowed in a 20-game span. So even Rivers above-average-looking day gets heavily adjusted to 52.7 (near average) when factoring in the opponent. Rivers has also played against the Colts and Jags, both of whom are in the bottom third of the league in adjusted QBR defense.Biggest gain in QBRAlex Smith has faced a fairly rough set of defenses in his teams first four games, squaring off with three of the top 11 defenses (San Diego, Houston and Pittsburgh) in his first four games. His lone game outside a top 11 defense came against the Jets, who rank 30th. Things dont get much easier for Smith, as eight of his final 12 games come against teams currently in the top half of the league.It is also important to remember that the impact of opposing defenses over small stretches (such as four games), can certainly show large differences, but by the end of the season these differences tend to shrink. That is not to say they are not important, just that there is less tangible disparity in the quality of defenses in the NFL as more games are played. 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