He was giving Superman a pretty even fight, but it's impossible to tell how much of that was because of his natural durability, and how much of it is because of the ring.
Kilowog fought with that yellow Lantern that was about his size without rings I believe. Maybe we can do comparison there, because that guy fought Daxians (w/e they called).
you mean arkillo? the sinestro corp member that fought viciously again mongul jr, both not using their rings? fight ended with him getting his tongue ripped out but he went blow for blow with mongul for awhile. (please log in to view the image)
kilowog fought and beat arkillo if i remember correctly their fight included their rings but was mostly a h2h scuffle.. i dont see thing being able to deal with arkillo and i regard kilowog above his lvl so i doubt thing can keep kilowog down.. even if its close he has that whole 'willpower' thing going for him and i see him outlasting thing.
You're right, but the thing is we know the rings can amp a character substantially. Kilowog has pretty decent natural durabilty and strength, but there's no way of telling if he's Arkillo's equal, or if he was using the ring to bridge a gulf (As he may have been also doing against Superman)
Who's the blonde GL that was helping Daxam? I believe she has human level stats, yet she hit the yellow sun empowered Daxamite leader after he made a racist comment, and drew some blood.