lol, not even close to Tyson if you have seen his fights. Shamrock, Severn and Kimo were slow as fuck. Kimo was a bodybuilder, he moved like molasses. I'm talking about footwork, about agility, when someone grabs you, how well can you get out of the way.
The guys Royce beat WANTED to tangle up with him because they were hoping they would out grapple him Except for the one-gloved freak that was old and slow. Many times Royce clinged onto someone and slowly dragged him down, it took over 10 seconds.
If Royce by some miracle managed to cling to Tyson without being decapitated on the way in, it would take at least 10 seconds to get Tyson down. Half a second of clinging and Royce would have been unconscious by a quick hook.
Btw, Royce was very lucky that Severn didn't know he could punch from the top (GnP wasn't invented until Coleman) Severn could have beat him to a pulp with all that time Royce spent on the bottom to sink in the triangle. It took him a long ass time, he wasn't that good, Werdum could have probably done it in a couple of seconds.