Luther Mccarthy came roaring out of the gate at a young age, defeating many of the top white contenders before he even turned 21...before he tragically he died in his fight with arthur pelkey. Had Luther Mccarthy's health been fine and kept fighting at the pace he did, you think he would have been the one to dethrone jack johnson, and potentially set up an epic trilogy with jack dempsey around 1919 both figthers at there peaks? Mccarthy was 6'4 220lb over 80" reach, and ive heard he was one of the more athletic big men of the era.
Maybe. there's no telling how good McCarty may have become, though it's possible he could have been good enough to give prime Dempsey a run for his money.
If McCarty show any skills to be good or great. Dempsey would have fought him like he did Wills and Greb, oh wait.
To be honest, i would be very surprised if he beat Johnson. It is all theoretical but if he was as good as some people think, Johnson v McCarthy would have been built as a massive fight, and johnson would have come in in tip top condition and, imo, he would have wiped the floor with McCarthy, like he did with everyone else he got serious with. Even if McCarthy did find a way to beat Johnson, by the time Dempsey came along, McCarthy, like Willard would have lost motivation, been overconfident and probably come in out of shape. If he did so against Dempsey, he would be mauled the same way that Willard was (as would have any heavy alive). And this probably would have taken away the demand for a trilogy. I think that a bigger missed trilogy from the era was a Burns-Langford, Hart-Johnson, Johnson-Willard, or perhaps the biggest of them all - Dempsey-Johnson.