Broner will surely be the worst 4 weight "world" champ ever if he wins. Khabib for the vacant WBA lightwelter title. Both coming off a loss.

Superfeather - Vacant WBO title against Vicente Martin Rodriguez.
Lightweight - Antonio DeMarco for WBC title.
Welterweight - Paulie for WBA title.

On a side note - Guzman was well past his sell by date when he fought Khabib. And on another side note - Guzman in his pomp would have schooled Broner at any weight.