Lets be clear though, each of his Heavyweight opponents barring Monte Barrett have been business decisions. Valuev was offering more money than Vitali or Haye, so he fought for that version of the heavyweight title. Winning it was a bargaining chip for more money with the Klitschko's so he had to fight Ruiz (mandatory) or he'd have been stripped of said bargaining chip. Then he fought Harrison because it was no risk and massive financial reward. Harrison didn't deserve it, but it was an easy payday. That isn't avoidence, that is purely refusing to fight for a smaller slice of pay.
Bookmarks