Burns was only under 160lbs early in his career, before he peaked. So we have to assume that version. Armstrong was only 142lbs vs Garcia for a version of the MW title. Difficult when pitting fighters from eras this far apart when each competed to different sets of rules and conditions. If you sent Armstrong back in time to Burns' era, my guess is he'd be too small even at MW and WAY too small vs peak Burns above MW.
