Now that the last decade is on the books, here are the first- and second-team AP All Pros at CB in each season from 2000-2009 (the first two names are the first teamers, the second two names are the second teamers, except in 2005 where there were 3 first teamers and 2009 where there were 3 second teamers):Sam Madison, Samari Rolle, Charles Woodson, Champ BaileyAeneas Williams, Ronde Barber, Sam Madison, Troy VincentPatrick Surtain, Troy Vincent, Ronde Barber, Bobby TaylorTy Law, Chris McAlister, Champ Bailey, Patrick SurtainChamp Bailey, Lito Sheppard, Chris McAlister, Terrence McGeeChamp Bailey, Ronde Barber, Deltha O'Neal, Terrence McGee, Nathan VasherChamp Bailey, Rashean Mathis, Ronde Barber, Nnamdi AsomughaAsante Samuel, Antonio Cromartie, Champ Bailey, Al HarrisNnamdi Asomugha, Cortland Finnegan, Charles Woodson, Antoine WinfieldCharles Woodson, Darrell Revis, Nnamdi Asomugha, Asante Samuel, Leon HallNow, what does this mean, and what on earth does this have to do with Brandon Marshall? If you look at the 19 first team AP All Pros (not counting last year's), you'll see that they repeated as a first-team AP All Pro in year N+1 just twice (both times by Champ Bailey). First team AP All Pros in year N wound up appearing on the first or second team in year N+1 just 9 times out of a possible 19 (3 of the 9 were by Bailey). There was no season in the past decade where both of the first team AP All Pros were represented on the first or second team in year N+1. In short, there is not a lot of recent history of CBs posting elite seasons back-to-back. CBs can remain very good from year to year, but the only player in the last decade who produced a dominant season and managed to follow it with another dominant season was Champ Bailey (who managed to go back-to-back-to-back).Unpacking this idea a little bit more... Revis was unbelievable last season. Nobody could get open against him (except for Ted Ginn, of course). This year, while he's still almost certainly going to be one of the best CBs in the game, the odds of him putting up that kind of season, the kind of season where you even sit uberstuds if they're up against him, are incredibly low. It's far more likely that he returns to "merely very good" levels (a la Rashean Mathis), and possible (albeit unlikely) that he regresses all the way down to "a bit above average" levels (a la Lito Sheppard).Long story short... I think it's ridiculously premature to be worried about matchups at this stage of the season.