this fight is obviously about money but silva is full of shit about the credibility thing. plenty of hasbeen boxers (although not anywhere close to roy's calibre) have been owned in the mma. mainly because mma is where you go when your boxing career is over.
takes a lot of heat and desire to be a top flight contender in mma. you don't just go there because you can't box anymore and no longer want to fight, as ray mercer found out.