Hmm, not convinced by the original argument in places.
*Hard to say definitively who the best hw, mw etc is since a number of individuals have fought at more than 1 weight at ADCC.
*Refer to them as greatest submission grapplers, not greatest grapplers. Werdum et al would be beaten up if they fought Taymazov or Makhov or other great non-submission grapplers.
*A significant propostion of the early ADCCs had worked matches, i would be hesitant to include PDP or JJ Machado or others as a result.
*The most successful BJJ players at ADCC are Ricardo Arona and Mario Sperry with 4 golds. Mark Kerr also has 4 gold (and a silver).
*I don't really agree that the quality of competition at HW/+99kg has really improved that much, i'd say 2005 was peak for depth of competition with Monson, Werdum, Napao, Pe De Pano and Daniel Gracie in there. 2007 and 2009 were weak in comparison (2007 very weak). 2009 saw a number of big name stars on their last legs competitively (Erickson, Jaoude, Saulo and Monson) and a number of "blown up" lighter guys (Barral, Abreu and Saulo)
*Monson only has a gold, a silver and a bronze at HW/99kg+, he also has a gold and a silver from -99kg (beating Saulo and losing to Arona respectively).
*Galvao is some way from being the best WW BJJ player to have done MMA, Renzo Gracie is (2 time ADCC champ, albeit see comment above). Serra, Shaolin, even Leo Santos would be ahead of Galvao too.
*I'm not sure i'd include Alexandre Ferreira/Cacareco in there since he is primarily of Luta Livre origin.
*The Nog brothers are not outstanding Sports BJJ practiners, but Big Nog at least has a number of impressive performances at the mundials, pan ams and brasilieros - little Nog has never medalled at any belt iirc.
If i had to say who is the best ADCC player "of all time" with a BJJ background factoring in weight class and absolute performances but ignoring the relatively meaningless superfights, and then say then it would be:
HW/+99kg: Marginally Jeff Monson (2 weight titles) over Fabricio Werdum (2 weight titles), a) because monson has more 2nd places and b). when they fought in 2005 Monson beat Werdum.
LHW/-99kg: Ricardo Arona (2 weight and an absolute title)
MW/-88kg: Saulo Ribeiro (2 weight titles)
WW/-77kg: Marcelo Garcia (3 weight titles)
LW/-66KG: Royler Gracie (3 weight titles)
And if i was to say MMA fighter with a BJJ background/solid performance at ADCC then by record/calibre of opponents, probably:
HW/+99kg: Werdum (2 weight titles) - but only on current form/with that win over Fedor, he has some notable losses on his record. For breadth and depth of Career, then Big Nog.
LHW/-99kg: Ricardo Arona (2 weight and an absolute title)
MW/-88kg: Demian Maia (1 weight title)
WW/-77kg: Renzo Gracie (2 weight titles)
LW/-66KG: Rani Yahya (1 weight title) - Royler's mma record isn;t that notable, Penn has never fought ADCC, Aoki doesn;t have much in the way of a no gi comp record and, regardless, he is primarily a judoka with great newaza, not a BJJ player.