I'm not sure if Zain, internationally, has been considered great on top. Actually this was a criticism about him for a while. Such a stud collegiately, but unable to get the turns in freestyle.
Yes, Zain got a couple turns this weekend, but it honestly would not surprise me if you told me that Lee has scored more points in international tournaments from top in the last six months (three tourneys: Farrell, Pan Am, Last Chance) than Zain has scored over his entire international career. In fact, Zain's most noteworthy par terre attempt up until now may have been the lace where he pinned himself.
I am all in for Zain medaling, I just think he is going to have to score a majority of his points on his feet after wearing the opposition down.