im curious to know how well rogers students do in competition if he has produced any top blacks on the competitive scene today
I don't know about top black belts but my old instructor is a Roger Gracie black belt and he's won national and European titles. Here's his list of achievements:
Silver Medal at Polish Championships 2014, Adult Middle Heavy, Black Belt.
Silver Medal at IBJJF London Open 2014 Adult Middle Heavy , Black Belt.
Gold Medal at British Open Championships 2014, Adult Middle weight, Brown Belt.
Silver Medal at IBJJF European Championships in Lisbon 2013, Middle Weight, Master 1, Brown Belt.
2 x Gold medal in 2012 IBJJF European Championships in Lisbon, Middle weight and Absolute Masters 1, Brown Belt.
Gold medal at British Open 2011, Adult, Purple Belt.
Gold medal at World Pro Trials in Warsaw 2011, Adult, Purple Belt.
Gold medal in Absolut at British Open 2010, Adult, Purple Belt.
Gold medal at Gracie Invitational 2010 in London, Adult, Blue Belt.