Re: Benny Leonard was the greatest lightweight of all time - by a long way
Leonard's record is similar to Harry Greb's - if you look at his, you'll see he mostly fought over 160lbs and therefore a hell of a lot of his career is more of a light heavyweight adventure.
Or maybe just a big middleweight's. With some fighters, especially in the old days where the best opponents frequently in non-title bouts, you have to give them the benefit of the doubt. The only time you wouldn't is if they couldn't actually make the weight, but Leonard always did upon defence of his championship.
The Britton fights should bode well for Leonard more in a pound-for-pound sense than a lightweight one, but then he didn't weigh above the limit by a monumental amount - he was hardly a welterweight. Just like Monzon's win over Bethea, it wasn't a light heavyweight victory.
Leonard was a lightweight as much as Harry Greb was a middleweight. Of course, Roberto Duran himself fought many non-title bouts over the limit during his reign as champion.
The Dundee series is difficult to gauge. Now I haven't looked into it properly, but I generally gathered that Leonard came out on top. Best for him if he did, but if not then it wouldn't necessarily mean Dundee was better. Ike Williams notoriously faced problems with Willie Joyce, losing their series 1-3, but we all know who the greater lightweight was.