Re: Prime James J. Jeffries vs Jack Johnson
I'm actually reading a book on Johnson right now, just as he's fighting Burn in Australia for the heavyweight title. He brought up a good point that may also apply to Jeffries. He said that Burns fought in a crouch and had to raise himself to launch an offense and any good boxer could hit him during the transition.
Also Johnson was a master at avoiding getting hit. So if Jeffries couldn't hit him for several rounds he could easily tire himself out. I would also suggest that Johnson had far, far more fights under his belt than Jeffries did and fighting all those black fighters repeatedly would be harder than fighting many of the titled Jeffries fought.
So it's a tough call, but obviously I'm favouring Johnson.