I have seen Choi fight several times and every time he steps into the ring he looks like a major dork. However, in that picture he looks scary as hell!
Gonzaga: Nah. I don't think this is the end for him. I think he got overrated (I'm guilty of this too) after beating Cro Cop. Now it will probably swing too far the other way. Werdum is a very good fighter that probably always had the potential to be Top 5. I know he looked liked crap in his first fight in the UFC but you really have to go back and look at his PRIDE career. His BJJ is world class and his striking has continued to improve thanks to being Cro Cop's sparring partner (although I think they recently parted ways and Werdum is with Chute Boxe now).
Lesnar: Yes, I think Lesnar has more than a chance. He really impressed me during his first fight at K1 Dynamite. Granted Kim is a bit of a can but Lesnar's wrestling skills are legit, he's probably the strongest man fighting in the weight class and he moves like a MW. That's really astonishing for a guy his size. We don't know really know which Frank Mir we're getting but I have the hunch that even if good Mir shows up he is simply dominated by a powerful wrestler. However, with two highly skilled ground fighters there's always the chance it turns into a sloppy slug fest. If that happens it's anyone's guess.