I think the reason is frankly the hendrick cars kinda suck this year. Jimmie has some wins but other than the wins hasn't really been in the hunt at all. in fact his car has been at times frankly off and running like crap. Look at the practice sheets they never seem to unload fast. I know dale jr is back from an injury but if he is 28th on the practice sheet off the truck, lets just be honest the car sucks. Jimmie is often in the teens or 20's himself when they unload at the first practice. That is simply too much to dial in on raceday. Another thing I noticed is pocono and michigan a place where hendrick engine power should at least count for something hasn't counted for anything, Other places where hendrick cars should have been way better are martinsville and honestly the cars haven't even been very good on the plate tracks. I know jr won the pole and all but stenhouse and others had better race cars. in the past dale jr was able to hold leads out front of the pack, he just hasn't had the car he has needed on those tracks.
beyond that I think dale jr is a rythem and confidence driver. He has to build up to going fast. OR the car just has to be quite a bit better than the other cars he is racing. Dale jr isn't the type of driver that summons something down deep and steps it up a couple notches. those drivers are, JJ, harvick, Kyle busch, and brad k. Right now I don't see the same level of confidence from the drivers seat from dale jr. look at his past seasons when he as won. his wins came in bunches OR they were a luck win on fuel mileage or something. I also feel he has not been the same driver after the '04 season.