It is true, the UFC's lightweight division has moved on from Khabib Nurmagomedov, as hard as that has been.
It's been more than a year since Nurmagomedov's sudden retirement, and the UFC crowned a new undisputed champion, Charles Oliveira, in May. Nurmagomedov remains happily retired, and there is no indication he will ever come back. So, yes, the division has moved on -- to an extent.
Why hasn't the 155-pound division moved on entirely into a new chapter? There is still one loose end to tie up. And that involves Dustin Poirier.