Forgive me, I neglected to write youngest man to win a version of the Heavyweight Title. EVERYBODY knows Wilfred Benitez is the youngest man inclusive of all weight classes.
WBO was garbage at the time, nobody gave that Title any respect. It was WBA, WBC, and IBF.

Lineage was broken because lineal Champ Michael Spinks retired as Champ. He unretired and Tyson destroyed him making Tyson The-Man-Who-Beat-The-Man.
Ali had beat Leon Spinks, so Ali was The Man.
Ali retired as Champ, but came back when Holmes was Champ.
Holmes whupped Ali making Holmes The Man.
Michael Spinks got the decisions against Holmes making Michael Spinks The Man.
Michael Spinks retires as Champ, but came back for the huge payday when Tyson was now Champ.
Mike Tyson destroys Michael Spinks making Mike Tyson The-Man-Who-Beat-The-Man.
"To be The Man, WOOOOOO, you've gotta beat The Man!"

In 1989, prior to the 1990 Douglas fight, I distinctly remember Ring Magazine had Mike Tyson at pound-for-pound #1. And I agreed with it that Julio Cesar Chavez was #2. Ultimately Chavez had a better, more consistent career, but for those few years, Tyson had it all.

And migwetch, that is Jose Ribalta.