marcelo uses gi grips. gi grips are stronger than no gi. he uses them in the mundials. i am not sure if he uses them in gym just rolling.
gi grips really are better and if you are rolling in a gi and not using them you are kind of stupid.
first video i found on youtube. i thought i might have to watch a few mins of the match but i only had to watch a few seconds. or do pistol grips on sleeves not count? within the first minute > sleeve grip, collar grip, back to sleeve grip, to belt grip. note: i am saying gi grips for control.
Marcelo mostly uses the pistol grip for the 2 on 1, the occasional collar or pants grip when passing (though he mostly either smash-passes or passes via half guard), and a couple of gi chokes, mostly the bow & arrow (and often hits the RNC in the gi still). I never said he didn't use gi grips, but very few of his moves utilize them.
As for gi grips being stronger than no gi grips, this is true. However, intelligent grip fighting doesn't involve my opponent and I having the same grips simultaneously, in which case he would win due to grabbing cloth. Grip fighting means that I block or break my opponent's grips, take my own grips (2 on 1, underhook, head control, leg drag etc.) and put him in a mechanically shitty position. When I win the grip fight, control the inside space and positionally dominate my opponent, grabbing my gi will not allow him to negate my position just because I'm not grabbing his.
I just use a game comprised of no gi techniques that also work in the gi. To say that I'm stupid for not gripping the gi, well ... that's like saying anyone who doesn't use a particular type of game is limiting himself. Everybody specializes in some way. And if my approach isn't ideal for winning Mundials, well - I'm not making a run for the gold any time soon. I prefer techniques that work with and without the gi for a number of reasons, one being that I like no gi, another being that I work as a bouncer and care about universality for self defense purposes. Lastly, I've been playing guitar for 14 years and would like to continue doing so at a high level of proficiency for as long as I can, so not grabbing the gi saves my fingers a lot of wear and tear. If this hurts anybody's macho sensibilities, I feel sorry for them.