im not sure money would matter to kostya. busting mundines mouth may. middleweight is in kostyas range. a weight he will be strong at and still fast. power will be no issue either. inactivity will be. mundine will struggle to make middle. it will affect his performance. he will be weakened. kostya WILL land a right hand or two......can mundine handle it? it may never happen. but at middle, it would be interesting.
This post proves that you have NO understanding of boxing. If he came back Kostya would have trouble fighting and beating a top 10 147 lb fighter like Clottey or Collazo let alone Mundine at 160 lbs.