Jake Shields striking is whack, he does have a good ground game but so does gsp. I think GSP will beat shields via GNP stoppage.
Johnson needs to rebuild. Next up is Hardy who is good but other than his durability and power, I'm not sure if he is a legit threat. Woodley has the most promise so far. Not on paper but he just looks good.
I'm not saying he has a good, chance, he certainly has almost no chance, just that nobody else has a better chance. There is a difference. There has to be a biggest threat to him outside of the UFC, the answer can't be "nobody."