Paul Schreiner is the black belt who now teaches at Marcelo's (and trains under him). He moved out from California over the summer. (The IBJJF spelled his name wrong on the nogi pan list. In fact the whole results list is screwed up in different places for some reason. Notice the men's names under some of the female divisions.)
Henrique Resende is the black belt who runs Marcelo's academy in Florida. He's pretty good and most likely would be considered Marcelo's top student. Marcelo's wife is supposed to be pretty good although she hasn't competed in a little while. And Emily Kwok is now under Marcelo.
I don't know that he's been open long enough to have a bunch of top students since that takes years to cultivate. But I bet if you give it another year or two, he'll be producing some.
As most people have already said, Marcelo has a bunch of very good students.
Not only is he an amazing competitor, but he has been teaching since he was a blue belt (in Brazil), and is an amazing instructor and coach. He routinely has world champions (Gi / No Gi), UFC fighters (Mark Bocek, Hermes Franca, Kurt Pelligrino, etc), etc come to his academy to train and learn from him.
This past Pan Am No Gi tourney in NYC, his academy won the first place for Masters/Seniors and Women's division- an excellent achievement given the relatively short time he's been there.
I am confident that within the next few years, you will see a bunch of his students begin winning big tournaments- he trains them hard, and like I said, teaches them fantastic stuff.
This month he has Gabi and Luana visiting from Fabio Gurgels in preparation for the No Gi worlds (In response to a past posts- I'm pretty sure these two still rep Alliance/Fabio Gurgel, they were wearing MGinaction patches at the worlds).