I don't think they are overrating him at all, I think more people are actually underestimating him. Jan is a serious threat. In the face-offs it's clear he's the bigger fighter, you can easily see it in their body frame. Jan has bigger shoulders, chest, back, torso, arms, etc than Adesnaya. All Adesanya has is a slight height advantage, but physically Jan has all the advantages. Adesanya will need to use his speed, avoid the clinch/takedowns, and avoid getting clipped by Jan's LHW one punch KO power. They both have paths to vitory, but the people dismissing Jan like he is an easy fight may be surprised with how the fight plays out. I'm sure it's the same people surprised by the Reyes fight outcome.