For those saying this is too big a step up for Costa, consider Yoel's rise to the elite of the division: stoolgate vs Kennedy followed by destroying a washed and broken Machida, then immediate jump to Jacare who was on an 8 fight winning streak. Yoel won a controversial split decision where he was fence grabbing (12/17 media outlets scored it for Jacare, 3/17 scored it a draw) then pissed hot after the fight (it was found to be tainted supplements but the fact remains he was "enhanced" for the fight). After that he still got the UFC push into elite status and fought #2 ranked Weidman in what at the time was expected to be a #1 contender fight but Bisping's fuckery derailed all that
Once there Yoel would prove that he did indeed belong in the elite of the class, but his road to that status was very controversial and highly backed by a UFC push very similar to the push Costa is getting. Yoel is currently coming off a loss and riding a losing record in the past 2+ years but he's (rightfully) a big name still; a Yoel/Costa fight right now is perfect timing and great matchmaking imo