The last cruiser-weight champion was hornswoggle but he gave it up so nobody is the cruiser-weight champion
its a category in boxing weight limits
The champion from each weight class in each boxing organization.
From April 5, 1915 to July 4, 1919 - Heavy weight boxing champion - Jess Willard ( American )
Wasn't Wladimir in as champion at that point(?)
Unfortunately there is no undisputed heavyweight champion.