There are no common fights because Anderson hasnt fought the list of great Wanderlei has. The Hunt match was taken at the last minute after W was set to fight Sakuraba (thus the disparaty between the traing would have been enormous). Henderson KO'd Wanderlei, but it was a single punch, which can happen to anyone. He actually defeated Henderson the match before that. Anderons, in my opinion, looks very "elusive" because he is standing in front of second caliber talent. He is certainly high caliber, but it troubles me to declare someone "grea", much less "the best pound-for-pound" when we havent seen much. There have been a long list of fighters that at one time were declared "unbeatable" only to crash and burn. I will say, though, that any grand declarations in MMA should be met with incredulity, given the fact that certain people match up so differently with each other.
Also, the announcers of the fights deliriously grandiose declarations aside, a rear choke is one of the simplest manouvers in the world, and doesn't prove anything close "versatility".
Firstly a rear naked choke is not easy to secure, it is difficult. Everyone knows the defense, everyone knows it is coming, and their are few other options outside of risky, low percentage submissions. Almost all submissions are simple movements, the difficulty is setting them up against a resisting opponent.
Seconly as I stated earlier they do have a common recent opponent: Dan Henderson. Dan Henderson KO'd Vanderlei, Dan Henderson hit Anderson flush, but did not KO him. Dan Henderson therefore is more of a testament to the durability of Anderson while a detriment to the durability of Vanderlei.
I understand that Vanderlei won a decision to Henderson once, but that was back in 2000, not anytime recent.
Since 2005, Vanderlei's win-loss record is 5-5, and two of those wins are split decisions. His only high ranking win in recent times is a split decision againt Ricardo Arona. Jardine, while a solid competitor, is outside of the top rankings due to his inconsistencey. He may win against opponents like Forrest Griffin, but he also loses to opponents like Alexander Houston.
Since 2005 Anderson's win-loss record since 2005 is 9-2. Despite your claims to mediocre opposition, I would consider lopsided thrashings of Rich Franklin (x2 defending champ then former champ), Dan Henderson (former pride mw and ww champ), and Nathan Mardquardt (King of Pancrase) at least as impressive as a split decision win against Ricardo Arona, a split decision win aginst Hideheko Yoshida, and a KO win against Keith Jardine.
In regards to the "second caliber" talent such as Dan Henderson (yes, the same "second caliber" striker that KO'd Vanderlei) and Rich Franklin perhaps the better question would be "Who isn't second caliber in the mw division in your mind?" You're putting the former Pride middle and welterweight champion and the former UFC middleweight champion in the "second caliber". Who does Anderson have to beat to get your respect as a legitimate pound-for-pounder? He essentially won the UFC middleweight belt in lopsided fashion, then defended it easily, then unified the Pride WW and UFC Middleweight titles by thrashing Pride's champion.