As I'd said, Couture stalled. However, you have to be hard to sweep to stall successfully against Jacare - I doubt anyone on the forum could pull it off. Dana_is seems to be saying that after Dan took down some of the forum members they would sweep him. I'd bet fairly heavily that they wouldn't. Would Dan pass their guards? I don't know, in MMA he deals with the situation by sitting in guard and using ground and pound. In grappling he'd be likely to just sit there, shrug off their attempts to sweep, regain his feet, and take them down again. Guys like Jacare are good enough to keep him regaining his feet, I doubt anyone on here could.
If Dan was easy to sweep we'd see it being done all the time in MMA ... he competed against guys like Big Nog, Arona, Palhares, all of which have better sweeps than anyone on this forum. Given that Dan wasn't winning with striking, he clearly spent a lot of time on the ground against top level MMA grapplers. If he wasn't swept often by guys like that, I think its a stretch to think people on this forum could do it (unless Josh Barnett is still on the forum, or someone at that level). People underestimate just how good top level athletes are.
You see this in hockey and baseball forums. Guys will watch pro's being paid several million a year to play sport, see them make mistakes, and say they could play better than that. I think they're dreaming; yes top pro's sometimes have holes in their games. However, what they do well they tend to do very well, and it takes another top pro to make them pay for their mistakes.