i've heard this said many a time, i heard larry merchant say this about tyson, marciano, frazier etc
they say that fighters of the marciano-tyson-frazier mold cant have long careers instead short blazing careers.

i mean lets see, tyson fought for 20 years. 3 nd half years he fought with good defense, he became a slugger and took alot of shots for the other 17 years. but still he looked great even after 20 years for onli a few rounds tho (cos of heart and hunger reasons)

tua as been a pro since 1992 or 1993 and is still fighting, he relys more on his cross arm peek a boo unlike tyson who relys mainly on head movement. both similar type of fighters.

what do you guys think, is this a myth?