Because they are trying to prevent the mess that happened at FW. If Connor fancies taking a year off the division can move on. Khabib becomes the interim and defends it if he wants or waits for Connor. Either way that title makes him number contender regardless of if an aldo makes the jump or a fighter on a streak has an exciting win against someone in the top 5.
It's not that hard to figure out
The FW mess should not happen again, strip Connor if he wants to hold up divisions, I just don't see the point in interim belts when they are bullshyt.