Rampage was one of the top guys during the best time of the 205 div.
The Pride version of him would've taken Jan down and beaten him via top game, as Jan showed in both the Gus and Glover fights that he can't escape from the bottom, plays closed guard for the full round.
The early UFC version of Rampage was a counter boxer, one of the best in the sport, as seen in the Chuck and Wand fights, the covering rolls. Jan can outpoint that version, but he's also at risk in every exchange. Quinton not so much, as his defense was great when coached by Ibarra.