I'm not sure that he's better, but he does have some history that indicates he can perform physically at a level similar to Zay.
He was the #1 junior college recruit in 2014, and went to Auburn, where he was kicked off the team after only a few games for team rules violations (I believe he was in a barfight.) . In his first game at AUburn he had 9 catches for 154 yards and a TD.
He led the CFL in receiving last year, and looked very good in preseason along with several circus catches that have made the internet rounds since he's been with the Bills. He's also a guy that has blown opportunities, and has talked about how he knows he's probably on his last chance, so I'd be very surprised if you saw him not at least contest those deep balls we saw yesterday.