Least & Most Vulnerable Favorites?

[Sightseek]

While I know some smart ass is going to comment that the fields haven't been officially posted yet (and we haven't even discussed the weather ), but I am sure we are all busy handicapping when we should be out Trick or Treating...which favorites in the Breeder's Cup do you see as being the least and most vulnerable?

(I fear this will become another Z thread )