Fedor -- fought mostly cans. Sorry, Zuluzinho does not count as a prime fight defense. It just doesn't.
Please, allow me to respectfully refute this missguided post with facts.
Fedor's schedule vs top fighters was similar to Anderson Silva's, who's one of the longest reigning UFC champion ever:
Anderson Silva's top wins per year in the UFC:
2006: 1
2007:2
2008:1
2009:2
2010: 2
2011:2
2012: 1
Average: 1.5 top fighters per year
Fedor's top wins per year while not in the UFC:
2002: 2
2003: 2
2004: 3
2005: 1
2006:1
2007: 1
2008: 1
2009: 2
Average: 1.6 top fighters per year
The only difference is that Fedor fought up to 5 times a year, while UFC champions rarely ever fight more than 3 times. Fedor fought some lower tier opponents
in between his top wins, which wasn't a bad thing since he was active and paychecks weren't as good back then.
Examples: Fedor fought Valavicius only 3 weeks after fighting Nogueira for the HW belt. Yuji Nagata was his 5th fight in 2003. His fight with Zulu was only 3 months after fighting Crocop. Fedor also had some lower tier fights after Pride folded, as he had a hard time finding top ranked opponents. Eg. He had to fight Matt Lindland after Randy Couture turned down a fight with him in Bodog for 3 million. The HMC fight also happened during the time Fedor was unsigned with any major organization. Few months later he signed with Affliction, which ended up having more top 10 HW's than the UFC.
Furthermore, decorated UFC champions like GSP, Anderson, Conor and even Mighty Mouse lost to mid/low tier fighters. And they were not fighting at HW, where even the low tiers are dangerous due to their size and power. That proves staying unbeaten like Fedor is extremely hard, no matter what. Even more at HW.
Overall:
-Fedor fought in the toughest HW divisions while he was a top fighter. Pride, Affliction and Strikeforce all had better HW divisions than the UFC.
-Fedor is the second HW with the the most top wins. (Nogueira being the only one above)
-Fedor had more fights per year than UFC fighters, but his schedule vs. top opponents was on par with a UFC champion's.
Other feats:
-10 years undefeated at HW (the easiest division to lose at)
-27 win streak
-More than 7 years in a row ranked #1
-Defended his #1 HW ranking spot 18 times
-At least 12 top ranked wins
-Multiple time world champion under different orgs. and rules:
*Rings Openweight Championship
*Rings Absolute Class tournament winner
*Pride HW champion
*Pride HW Grand Prix world champion
*WAMMA HW champion
-Over 70% of his wins were finishes
So yeah, Fedor is the GOAT.
Respectfully, Claude.