Date doesn't matter. He's had exactly 1 fight since losing the belt. 1 fight, and its not like this is a rematch. It'll be a completely new champion.
I've pondered over the figures a week ago, and by my estimate Poirier is most deserving of a title shot. He's had 3 fights each year for the last 2 years. Poirer is going into his 4th fight since Eddie lost the title, while he's had 1 fight in that same period.
Try not to fall into the whole Conman line of thought. Think of things from the other side!