[killerinstinct]

BJ Penn- He will not lose the LW title in a match. He's the greatest LW in the entire world and especially in the UFC. No one at that weightclass could even put him in too much danger

GSP- There's some up and comers that have enough KO power to catch him and knock him out, but for the most part GSP should be pretty safe with his title for a long while, that is unless he has to fight BJ Penn for the title. If that happens than GSP could very easily lose his belt.

Anderson Silva- He should be pretty safe with the title for awhile. If Dan Henderson works his way back into title contention than he could give Silva a run for his money, but other than that, there isn't an imediate threat to Silva's title run.

Rampage- I think he is the most likely to lose his belt first. I think that Machida could give him a run for his money and take his belt. He also has to worry about Shogun and Wanderlei as well, because they both hold dominate victories over him. Rampage has the toughest road as champion ahead of him.

Nog- There's a lot of solid up and comers in the UFC HW division, but most of them haven't reached their full potential yet and most of them won't for awhile. It is for these reasons that I think Nog should be safe with the belt for the time being.