Fedor ran from the entire UFC when they're HW division got really strong for a while. The UFC was going to pay him more money than any fighter in UFC history, and he wanted nothing to do with Brock who was smashing dudes at the time. There was also Carwin and Cain that were crushing dudes on their way up. Anderson ran from Sonnen for a long time. Especially before the 2nd fight. DW even stated that it took like 3 months to get Anderson to address the fight with him, and they had to force him in a room. Anderson didn't like the idea of fighting a guy who could take him down and control him. Anderson tried to duck Vitor when they fought as well, and used the whole Brazilians shouldn't fight each other routine, and the UFC pretty much and to force his hand there, even though he won in an impressive fashion. The worst was when he ducked Weidman for an entire year even taking a freak show fight with Bonnar who had just turned 40 and was thinking about retirement. What a slapstick match up that was. Might as well had been a WWE fight when Weidman was begging and begging to get his chance. Looking at that in hind sight now, boy was that pathetic that Weidman had to go through all of that just to beat Anderson when he could have won the entire time. Aldo tried to duck Pettis when DW tried to set up that fight at first. Took Aldo like 3 months to finally agree to that, and DW said multiple times that Aldo and his camp wouldn't entertain the idea of Pettis getting that shot. He finally agreed when the UFC wouldn't let him fight Lamas instead. He then tried to duck Mendes the 2nd time, and screamed for Lamas the entire time. He got his wish and Lamas got the shot eventually, because Aldo knew it was an easy win for him. Unfortunately for him, Mendes kept winning, and he had to fight Mendes a 2nd time. He won based on the judges. He had also pulled out of the original fight with Mendes due to injury of course, hoping that someone else would beat Mendes for him. Then came Connor, and Aldo kept acting like Connor was way to disrespectful for him to get the title shot during the world tour even though he had agreed to it. He even tally pulls out again due to some rib injury that he was cleared for, and Connor becomes the new champion. Guys like Penn, Cain, Weidman, Frankie, and GSP fought all comers. Guys truly carried themselves like warriors and what a belt holder should be. The UFC should have a rule that a belt holder should be willing to defend their belt at least three times a year. That is the whole point of having the belt to show that you are the best and will fight anybody. My vote goes to Anderson for king ducker though. Making Weidman wait an entire year was the most ridiculous thing I have seen from any belt holder.