You are forgetting something in your stats. Moss didn't play in the second half of game #5 and Culpepper had more yards in the 2nd half than he did in the 1st.
This is false. It is game 5 but week 6 vs. NO that Moss got hurt. Culpepper threw for 284 yards, 3 TDs, and 8 first downs in the first half and only 141 yards, 2 TDs, and 6 first downs in the second half. I'm not saying he played poorly... 141/2/0 in one half of play is very good... but still, the splits in that game support jwvdcw's point.EDIT to add the link:
Culpepper Game Logs
The real myth here is that Culpepper is going to struggle without Moss. Culpepper will become a better QB with Moss gone. His stats may not be as good right away, but they will be.
I'm not exactly sure what you're saying. I can see an argument that Culpepper will become a better QB without Moss to rely on. Part of that will come simply through more game experience & maturity. And part will come because he will actually be forced to read defenses better, now that the safety won't be cheating to Moss on every single pass play, and as he learns that, he actually becomes a better (read: more skilled) QB.However, I cannot see an argument that Culpepper will become a better FANTASY QB without Moss. Reasons:
1. More skilled does not always equal more productive. QB ratings don't score fantasy points.
2. Better implies that Culpepper has not yet peaked, but it is quite likely that he peaked as a fantasy performer last season, when he had one of the top few fantasy QB seasons of all time and exceeded his career highs by ridiculous margins.
3. The Vikes could well change their offense to be more balanced, meaning fewer pass attempts and, just as importantly, shorter pass attempts and/or less red zone/goal line passing. There have been some indications of moving in that direction.
Finally, if we're going to compare numbers with & without Moss last season, here they are in a bit more detail:
Culpepper with healthy Moss last season:
+----------+--------------------------+----------------+| WK OPP | CMP ATT PYD TD INT | RSH YD TD |+----------+--------------------------+----------------+| 1 dal | 17 23 242 5 0 | 6 25 0 || 2 phi | 37 47 343 1 1 | 8 41 0 || 3 chi | 19 30 360 2 0 | 6 13 1 || 5 hou | 36 50 396 5 0 | 6 30 0 || 6 nor | 26 37 425 5 2 | 7 13 0 |+----------+--------------------------+----------------+| TOTAL | 135 187 1766 18 3 | 33 122 1 |+----------+--------------------------+----------------+72.2% completion percentage and 9.4 ypa. Scales to 16 game totals of 5651 passing yards, 58 passing TDs, and 10 interceptions.

Culpepper with unhealthy but playing Moss last season:
+----------+--------------------------+----------------+| WK OPP | CMP ATT PYD TD INT | RSH YD TD |+----------+--------------------------+----------------+| 12 jax | 19 27 235 1 1 | 8 18 1 || 13 chi | 23 33 279 2 3 | 6 50 0 || 14 sea | 21 33 270 1 0 | 6 32 0 || 15 det | 25 35 404 3 1 | 4 22 0 || 16 gnb | 16 23 285 3 0 | 3 21 0 || 17 was | 27 44 299 2 0 | 2 24 0 |+----------+--------------------------+----------------+| TOTAL | 131 195 1772 12 5 | 29 167 1 |+----------+--------------------------+----------------+67.2% completion percentage and 9.1 ypa. Scales to 16 game totals of 4725 passing yards, 32 passing TDs, and 13 interceptions.Culpepper without Moss last season:
+----------+--------------------------+----------------+| WK OPP | CMP ATT PYD TD INT | RSH YD TD |+----------+--------------------------+----------------+| 7 ten | 24 30 183 1 0 | 3 4 0 || 8 nyg | 24 42 231 1 2 | 5 32 0 || 9 ind | 16 19 169 1 0 | 5 27 0 || 10 gnb | 27 44 363 4 0 | 3 19 0 || 11 det | 22 32 233 2 1 | 11 35 0 |+----------+--------------------------+----------------+| TOTAL | 113 167 1179 9 3 | 27 117 0 |+----------+--------------------------+----------------+67.7% completion percentage and 7.1 ypa. Scales to 16 game totals of 3772 passing yards, 29 passing TDs, and 10 interceptions.The numbers Culpepper posted in games missed by Moss are solid, but they are a far cry from the numbers with Moss. Without Moss, yards per attempt dropped substantially, as Culpepper presumably threw more to the backs and tight ends. Passing attempts also dropped, as the Vikes presumably focused more on the running game.
I realize that it is different preparing for the loss of Moss in offseason/preseason than adjusting in mid season. But it is still a solid counterpoint to those who think Culpepper will suffer no dropoff.