yeah "lineal" is thought of as the "man who beat the man"
does go back to the original belt holder. not an exact science as sometimes it can go vacant and you could technically say the line ended there. So it can be about who's the recognized "man" of the division but only if had gone vacant. Baldo was actually linear at welter for a little bit which shows its not about who's thought of as the best. And Roy was never lineal even though he was recognized as the best.
here's one sites list of the "lineal" line at light heavyweight:
http://cyberboxingzone.com/boxing/lheavy.htm
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