Great post. To answer it, I'm positioning it this way: Back in late August, if you were to have to bet your life savings on one of these events not happening, which would it be? I'd rank in this order:
5. LaFell becomes a viable WR (it's been done before, not too surprising)
4. Stork excels at center (rookie lineman have done this before and are well-coached in NE)
3. Collins makes second-year leap (not uncommon, but sadly on D we see more regression in year 2)
2. Chung excels as starting safety (I think most assumed camp fodder and depth at best before he started his second career)
1. Blount is the starting RB in December (just from a probability standpoint, this seems by far the most unlikely as he signed a multi-year contract with a rival, so it just has to be the most surprising occurrence of the season for me; I mean there is no way you'd pick this before any other event simply because so much else would have to fall into place)