Masato's nickname
As I researched, Masato has 4 nicknames. 
the Rebellious Charisma(反逆のカリスマ)
the Fighting Charisma(闘うカリスマ)
Mākun(マー君)
the Charisma of MAX(MAXのカリスマ)
The first one is named by the television staff. According to his interview, he hates it. Actually, I saw this name whenever he appears on television, and the narrator called him so. The second one is another nickname named by television director. This one was not used as much as the first nickname was. The third one is used by his wife and friends. The fourth one is that I found at  the official website of K-1, but it is written on only Japanese page. In addition, "Silver Wolf" is just a name for Masato's team or kickboxing gym he manages. Seriously, He has never ever been called so.　In my opinion, people who wrote for "K-1 Fight Club.com" and "K-1 Sport.de" misunderstood that Siver Wolf is his nickname when they saw the Masato's profile page in the official website.