I think he'd hold a couple of those alphabet titles and maybe take Wlad to the wire, a win for each guy then a third fight to top it off??
I think Vitali would have the power and the aggression to put Holmes under more pressure than he'd be compared to all the other top heavies of our time. Having said that, skillwise Vitali is not as accomplished as Wlad or Holmes...maybe Holmes could squeak by a victory or Vitali's sheer size, aggressive nature and power would do Holmes in?
Holmes would really spice it up against either bro but beat pretty much everyone else in the top 50 out there today. Maybe Haye could give Holmes trouble with his speed, angles and power but Holmes' heart sees him through to a victory.