I don't know of any site that has a top 10 list for BJJ.
It's tricky to say, but then again... should be easier to do than MMA. In MMA, you can't really have two guys of different weight classes fight and make any conclusions about who the better fighter is. In Brazilian Jiu-Jitsu, you can match up guys of different weights and, mostly, the only thing that matters is who has the better technique.
Off the top of my head... Roger Gracie, Marcelo Garcia, Ronaldo "Jacare" de Souza, Saulo Ribeiro, Xande Ribeiro, Rubens "Cobrinha" Charles are all guys that could make a claim for being #1. Then you throw in a lot of guys that don't really compete anymore in BJJ (B.J. Penn) or have moved up to the Masters divisions like Fabio Gurgel... it's REALLY hard to rank.
Then you throw in the fact that guys are very likely to grapple eachother, especially at the absolute class, with different results. Marcelo and Xande have beaten eachother. Marcelo's beaten Jacare, but lost in ADCC. Xande and Roger have grappled, to my knowledge, at LEAST four times. Jacare and Roger have gone at it a couple times. It's so hard to determine how to even rank those five guys.
