He also won against Jacaré and Machida.
He was also one of the last "modern" fighters to cross over to
K1, and it was for the most random Japanese reason: because Musashi and Mousasi sound a bit the same.
But the impressive part was when he beat Kyotaro Fujimoto, who was still the K1 HW champ at the time. And that was the same year Kyotaro beat Peter Aerts and Jérôme Lebanner (and lost to Semmy Schilt in the finale of the K1WGP 2010, but hey, Schilt always wins those)
Mousasi was always game for some unorthodox fights, like the
SUPER HLUK GP, having a submission grappling bout against Fedor, signing up for ADCC 2009 (but sadly he had to pull out... that would have been a very
"Kingo" thing to do, grappling against a bunch of BJJ aces),
As a big
Dreamcatcher/Young Vagabond/Kingo/Soldier of Fortune fanboy, let me check
Ah yes, must have been 2006, during his brief stint in PRIDE, when he finished the highly decorated
4th dan Judo Black Belt Hector Lombart &
Judo Gold Medalist Makoto Takimoto , and I didn't even dislike Makoto, but he had just beaten
Yoon Dong Sik in their rematch from their Judo days, so I was a bit miffed.
(and Takimoto would later submit
Zelg "Benkei" Galesic via kimura in PRIDE so I was justified in being suspicious of him... well, so did Dongbar [via dongbar], like 4 months later, but it's not an excuse)
This was probably a top 5 highest level matchup of Judo we got in PRIDE eh?
Same league as Satoshi Yoshida vs Ishii, Naoya Ogawa & Kazuhiro Nakamura.
And unlike many veterans, Mousasi is doing well for himself. Loses some, wins some... but he isn't on some bad losing streak like Tyrone Woodley, BJ Penn, Chuck Liddell, Shogun & Ninja Rua, Machida or Anderson Silva were...
Same for Hector Lombart (when he arrived in the UFC, he was suppose to fuck everyone up), Giblert Melendez (same thing), Conor McGregor, Robbie Lawler, Josh Koscheck...
Another thing Mousasi had for him is that he trained smart since the beginning, started with Judo, then quickly became an amateur boxing elite, then went full kickboxing, before turning to MMA and having great trainers and training partners... training with Fedor (when he was the MMA peak) must have been such a confidence booster...