This offense wasn't quite as vertical in 2004 as it was in 2003. Duante only threw 95 deep passes, which sounds like a lot but you have to remember that includes the 2 playoff games (although it is missing the week 3 Chicago game), so it's over the course of 17 games.
The easy answers to why the Vikings weren't as vertical is because of the Randy Moss injury, but that's really not the case. I broke down the Vikings deep route distribution into games prior to the Moss injury, during Moss' and recovery, and after Moss was mostly recovered (which I measured as the Seattle week 14 game). Here are the numbers on a per game average basis:
Weeks 1, 2, & 5
Total Attemps (15)
Att/Game (5)
Weeks 6-13:
Total Attempts (37)
Att/Game (4.6)
Weeks 14-19:
Total Attempts (44)
Att/Game (7.3)
Weeks 14-19 were higher in large part due to getting into the week 17 shootout with Green Bay (8 deep passes thrown) and having to pass to catch up to Philly in the divisional playoff (11 deep passes thrown). Keep in mind that the Vikings opponents in weeks 14-19 were the Seahawks, Lions, Packers, Redskins, Packers, and Eagles. That's only two good secondaries in 6 games in you include the Redskins, but the Redskins weren't even playing most of their starters in the secondary due to injuries. Even if you prorated weeks 6-13 to the weeks 14-19 level, you'd still only add about 22 passes, and that's assuming the Vikings wouldn't keep up the pre-Moss injury deep passing pace.
The numbers don't just show Duante going deep less often. They also show that he wasn't very successful at throwing deep. Cullpepper ranked 25th in deep completion percentage, tied for 13th in deep yards per attempt, 18th in throwing into deep tight/good coverage, and 20th in accurate deep pass percentage. Worse than any of those were his deep bad decision percentages. He ranked 28th in deep bad decision percentage and 26th in weighted deep bad decision percentages.
You might ask how much of a role Moss had in those bad decisions. Duante made 9 bad decisions on deep passes and 5 of them went to Moss. Culpepper had only 3 deep bad decisions through week 13, and then made 5 of his 6 other bad decisions on deep passes to Moss in weeks 14, 15, and 19. I don't know if it was Moss trying to put pressure on Culpepper, or if Culpepper simply threw caution into the wind, but the bad decisions certainly increased with Moss' presence. On some of these plays Duante also stared at Moss and made no effort to fool the defense as to where he was going with the pass.
I may be reading into it, but I think it's possible Duante threw those passes to Moss out of spite. It looked sort of like "OK, you want the damn ball, I'll just stare right at you and throw it up for grabs. You say it doesn't matter if you are covered? OK, prove it!"
Moss' game-time influence on Duante might be like that of the bad apple in school who your kid hangs around. Your kid ends up getting in a bunch of trouble because he simply did what the bad apple wanted him to do, but you can't give your kid absolution on it. He knew he shouldn't be doing it and he did it anyway. Once the bad apple is removed from the equation, though, your kid will likely go back to being the honor role student. I'd bet that the Vikings are thinking the same thing will happen with Duante once Moss is out of the picture.
One other odd thing about Culpepper's stats was how good he was at medium and short passes. He ranked 6th in medium completion percentage and 5th in medium yards per attempt. His bad decision and weighted bad decision percentages for medium passes also improved to 12th and tied for 10th.
Culpepper was terrific on short passes. It wouldn't be inaccurate to say that Duante Culpepper was the best short pass QB in the entire league. He ranked 1st in short completion percentage and short yards per attempt, and 3rd in both short bad decision categories. A lot of that had to do with the emergence of Jermaine Wiggins as a short passing threat, but even if Culpepper had Fred Biletnikoff as a possession receiver, I wouldn't have expected his numbers to be as excellent as they were.
Maybe the Vikings release of Moss had has much to do with a realization about how good is Culpepper is as it was about Moss' attitude. The Vikings asked Duante to alter his game after Moss' injury and Duante proved his skills by excelling in the revised offense. If he stays as good on short passes and improves his deep pass percentages in Moss' absence, 2005 could be a MVP year for Duante.