If you're asking if any of those sparrers were detected by Ruxxter and I when we were briefly staff on UN, they weren't. There were only two players that were detected using speedhacks and they weren't even relevant in the sparring community. I'm pretty sure they went unpunished.

I've always felt like Zeross and JaCk were a lot faster than other players, but can't accuse of blame them of anything when we ran several tests to see if anyone was doing anything illegal. Maybe they use a controller or something of that nature. Players often look a lot faster when they are are able to turn quicker and go diagonal more often. I don't think any of the guys in that list use any hacks.

I think the top three on UN are Zeross, JaCk, and David. I don't play there often anymore though so I could be wrong. I'm not a fan of sparring the same 3-4 people over and over or waiting forever to spar and that's the only reason I've switched over to iClassic really. I wish everyone else would.
iClassic has completely managed to ruin my concept of PC sparring, anyway. I am literally terrible right now.