Good match-up for Pettis. It's not that Anjos is an easy fight because he lacks in skill, he's very good, but that he's boxing-oriented with a ground game as a fall back plan.
He'd need to use that grappling here, but doesn't have top-notch wrestling to keep Pettis down. What's left is largely a striking battle and Pettis' footwork is too good to get into a brawl, and he's deadly from a kickboxing range. Pettis is also a big LW with long arms, which helps in defending TD's.
Khabib has the style to cause Pettis problems and is undefeated, that's the real title fight to me. Add that Khabib already beat RDA, and this fight is largely interesting because Pettis is fighting, not because he's fighting Anjos.