Heavyweights who actually defeated every lighter opponent?

Obsession with size has always been an enormous part of the posting public on this forum to the point where we have some posters who will use it as an actually argument. A fighter can even be denuded for defeating mostly smaller opponents but not defeating them quickly enough, indicating they'd have no chance with larger opposition.

Of course, "there are weight classes for a reason" so size absolutely is a key aspect for people heavily into fantasy matches, but the thought occurred to me, how many heavyweights actually defeated every opponent over who they had an advantage of at least 1lb in weight? Let's limit ourselves to instances of retired fighters who were at some point ranked among the 10 best by RING or TBRB who defeated every lighter opponent they ever faced?

See how long we can make this list.

 

01 - Rocky Marciano
02 - Chris Byrd
03 - Gene Tunney
04 - Ike Ibeabuchi
05 - Corrie Sanders
06 - Herbie Hide

 

A lot of active guys listed here and unless i'm missing one Spinks didn't fight any heavies who weighed less than him? I've decided to leave Tunney off as he lost to Greb for all that it was at LHW, not sure that's fair though. Did Byrd fight lighter guys at heavy? It was a long career tbf.

 

David Washington and Val Smith were both lighter than Byrd.

 

I think i'll keep it up for a couple of pages on whoever then maybe parse it off into a lighter ranked guys list.

 

Fitz is awkward as all hell, because if he was ever fighting a lighter guy it immediately became a middleweight or light heavyweight match, crazy stuff.

 

Drew with Mike Hunter, remember?