Does anyone consider Ernesto Marcel an ATG/Great? He was a professional for a few months less than 8 years. Sung-Kil Moon was only a pro for 6 years. Khaokor Galaxy only fought for 4 years. Marciano packed it in after about 8 years.
Jack Dempsey was a great fighter for about a year and then devoted his energies to slacking, banging starlets and ducking Harry Wills.
But Seamus, look what he did to jess willard! He would totally do the same to Wladimir Klitschko...raa raaa raa riiight?