multiple world titles in different weight classes? I know Henry made a defense of the WW and LW crown simultaneously. Was there anybody else to do so?
Did Ross have the 140 and 147 titles simultanously? Not sure These days you cant actually keep both titles, ie the WBC asked Mayweather if he wanted the 147 or 154lb title and he had to give 1 up
Ross and Canzi indeed competed for the lightweight and junior welterweight titles simultaneously on a few occasions, sometimes against one another. Armstrong's welterweight title was not on the line when he faced Ambers. After Mike Spinks challenged Holmes, there was some idle speculation about both his LHW and HW honors being put on the line against Hagler, but Marv demurred, citing how his weight went right down during the training process.
Duran vs Leonard 3 Leonards WBC SMW crown was on the line but both fighters weighed in in the MW limit. I believe Leonard did not accept the belt so it was made vacant