Klitschkos, Dempsey, Marciano, Tunney, Schmeling, Johannson, Sanders, Morrison, Baer. In no particular order..
Vitali Klitschko James Jeffries Wlad Klitschko Jack Dempsey Rocky Marciano Gene Tunney Alexandar Povetkin Sultan Ibragimov Corrie Sanders Jim Corbett Max Schmeling Bob Fitzsimmons John L Sullivan * Just a guess ** Jerry Quarry Max Baer Honorable Mention: Cooney, Morrison, T Sharkey, Johannson, Willard Just a hunch, this list will have 5 new names on in 20 years. 4 guys, I listed did not retire that long ago, the other is 41 and still active. Hrgovic ( from Croatia ) scheduled to go pro in 2017 I think is the next #1 heavyweight by 2021.
More head to head if that makes you feel better. Sorry Janitor, the days of 210 or below heavyweight champions AND the days of champions with 74" or below reaches are OVER. Its not a fad or trend, its a fact from 1990-2017, and also verifed in the top amateurs. If the list was done in a pound for pound sense, I think you'd like it a bit better! Being #1 in a timeline is nice, but if the film is clear enough that to me matters the most.
Maybe. Maybe not. 5 years ago 6"8 250lb players like Lebron were all the rave. The game has changed they said. It is all about physicality and athleticism they said. And then Steph showed up... All it takes is one fighter to set a new trend. For instance, if a Dempsey or a Louis springs about and starts tearing down bigger fighters, but then has difficulty with a smaller guy, it could change the weight strategy for the next 50 years. I'm excited to see what this next century of boxing data will give us.