Foreman goes over Tyson on my list, because he is virtually the same in iconic status, if not slightly higher. He had same explosive point in his career, over roughly same period of time 70 though 74, compared to Tyson's 85 to 89. The opposition is comparable, Tyson met more B level fighters, but in Joe Frazier and Ken Norton, Foreman met and beat opposition that were better than anything Tyson fought in the time period.

But what swings it, is Foreman has redemption. He redeemed himself on November 5th 1994, by being only the fourth man to regain the World Heavyweight Championship, nearly 22 years after first winning it, at the age of 45. Thus wiping out the demons of the Rumble in the Jungle.

You could argue the first paragraph and give the slight edge to Tyson, but IMO the second paragraph blows Tyson away, he simply has not done anything like that in his entire career, indeed no one has.