I did some more digging...
An interim championship is a temporary world championship that is awarded in all four major sanctioning bodies of professional boxing (WBA, WBC, IBF, and WBO) and in other combat sports, such as kickboxing and mixed martial arts.
Occasionally, the world champion of a particular weight division is temporarily unable to defend his championship because of medical, legal, or other reasons that are beyond the champion's control. When this case occurs, two highly ranked contenders will fight for the interim championship of the same weight division—leading to two champions existing in the same weight division simultaneously. Once the world champion is able to return, he must fight against the interim champion. The winner of this bout reunifies the weight division as sole world champion. If the world champion cannot return or moves to a different weight division, the interim champion becomes the world champion.
This definition doesn't apply to the Kali Meehan fight considering Joseph defended the title, and there was an interim title being fought on the same card. I can only think that Izu's interim title was put on the table because Joseph must be vacating the WBO African Camp title, as he didn't put it on the line against Daniel Martz. I suppose he'll pick up belts, and vacate them as he rises up the rankings, so he doesn't have to defend the lowly belts later on... so I suppose in a fight or two, with no chance Izu and Parker fighting each other, Izu will have to fight for the full title, as his interim belt gives him the mandatory right.
An interim championship is a temporary world championship that is awarded in all four major sanctioning bodies of professional boxing (WBA, WBC, IBF, and WBO) and in other combat sports, such as kickboxing and mixed martial arts.
Occasionally, the world champion of a particular weight division is temporarily unable to defend his championship because of medical, legal, or other reasons that are beyond the champion's control. When this case occurs, two highly ranked contenders will fight for the interim championship of the same weight division—leading to two champions existing in the same weight division simultaneously. Once the world champion is able to return, he must fight against the interim champion. The winner of this bout reunifies the weight division as sole world champion. If the world champion cannot return or moves to a different weight division, the interim champion becomes the world champion.
This definition doesn't apply to the Kali Meehan fight considering Joseph defended the title, and there was an interim title being fought on the same card. I can only think that Izu's interim title was put on the table because Joseph must be vacating the WBO African Camp title, as he didn't put it on the line against Daniel Martz. I suppose he'll pick up belts, and vacate them as he rises up the rankings, so he doesn't have to defend the lowly belts later on... so I suppose in a fight or two, with no chance Izu and Parker fighting each other, Izu will have to fight for the full title, as his interim belt gives him the mandatory right.