I'm sorry but everyone seem to forget how physically powerful uvon really is... note he didn't use his aura up until he caught the rocket.
http://mangafox.me/manga/hunter_x_hunter/v09/c075/3.html
http://mangafox.me/manga/hunter_x_hunter/v09/c078/5.html
And here the sword didn't even make a dent with just his base aura used. And the bloody nose kurapica's punch made just shows how physically strong kurapica in that period of time as well(although that phys str increase can be attributed to ET's massive boost in both physical and nen pow levels).
And I must argue enhancers do get speed enhancements since. Reinforcement type nen boosts the natural abilities of nen users. Killuas god speed only affects speed not his overall damage/strength level. He not so much as give a tickle to yupi when they met up.
Just to clarify. Kurapica's hax skill is only applicable to chain jail it was all ET when he partly blocked BBI.
and to top it all off
http://mangafox.me/manga/hunter_x_hunter/v09/c080/19.html
Zaoldyeck, Ryodan, and Zodiacs are in equal footing in my bet when it comes to 1v1 fights.
So when silva said dont mess with the Ryodans, you've gotta be in the wrong state of mind to fight their most physically strong member.
Uvon is no joke combat wise. You see despite the RG's quick advancement to nen they were still relatively young compared to Masters. We can see that clear as day when yupi was still confused with his abilities, not only that; combat wise it will take them more than just years to catch up to how brilliant masters fight, with exception to meruem of course.
http://mangafox.me/manga/hunter_x_hunter/v10/c084/19.html
http://mangafox.me/manga/hunter_x_hunter/v25/c264/7.html
To make this understandable. Take genthru, he was considerably more powerful and combat savy than gon. But then he was exposed to a full powered rock! w/c I bet he used his full nen defense on his stomach to defend. So even a master nen user can't defend from a pure enhancers attack unless his type can use 80% enhancement. Now to a quick lesson with nen, Killua who is considerably stronger than Gon(yes, thats a fact) cant possibly win vs Gon when it comes to arm wrestling using nen because Gon is an enhancer and killua's type is far from enhancement.
http://mangafox.me/manga/hunter_x_hunter/v10/c084/9.html
To add this all up, yupi can't possibly defend with ko because he's got no knowledge of it. With that knowledge alone Uvon has a high probability of taking advantage of that weakness and punch a hole in yupis face. If anybody wishes to argue, yupi or any other RG hasn't face a pure Reinforcement master meaning no way he can tank BBI. Yes, RG's have enormous nen power levels, but that's just it they don't know how to utilize their own potential in a fight. BTW judging from this scan Zenos power levels must be rediculously high to warrant such response from pitou. "Complete Battle Mode"
http://mangafox.me/manga/hunter_x_hunter/v25/c263/12.html
To solidify this claim, just take it from this logic. Adult gon stomped pitou, pitou acknowledged his strength as a threat to the king(on par is highly debatable). Neteru fought the king and he said he wasn't even in the top 5 list of nen users. So going back to my claim Zaoldyeck, Ryodan, Zodiac(throw beyond in there too) are on par with each other... isn't it safe to say that their most powerful members can do much of the same to an RG as Adult Gon did? Let's say Adult Gon is really powerful but the same can be said for Gin, Silva, Zeno, Uvon, Illumi, Pariston, Hisoka, Beyond don't they warrant the same power levels as well?
I apologize for the long post and if it's a bit confusing it must be because I've had to research all those scans and I was having trouble patching it all up due to all that information.