I don't see how a ring would be a negative for Liddell, he is primarily a striker.. True he uses the cage to stand up, but he would be able to adjust fairly quickly.
This is just fanboy talk, Liddell would never go to pride and no top pride fighter will ever go to the UFC. But to Chuck's credit, he beat Overream, who is a fairly good striker (although he gassed horribly in that fight).
I'd put money on Silva/Shogun/Arona and lil nog to beat Liddell. But in reality Liddell could KO these guys just as much as he could be KO'ed.
I do think he'd beat Rampage in a rematch, he has gone downhill.