As of this post DJ is running about 10 to 1 in votes over Bell. Why the disparity? Serious question, why is DJ valued so much more than Bell? You referenced youth, they are really close enough to each other to call it a tie but Bell is a few months younger. In terms of performance Bell only gave you 12 games to DJ's 16 but Bell was actually slightly better in points per game and did so averaging half a TD per game less. Bell has impending contract situation but that should work out fine and the cast around him looks strong for a few years, Arizona seems down to one more year of Palmer.
I'm not trying to argue why someone likes DJ over Bell, just curious and frankly stunned at the wide gap between the two.
Personally I've not voted for either in my top 4, but they are next or would be if if they are still in the voting.