Okay, so what it sounds like is that Ganthet is to Kilowag close to *wiggles hand* what Furnace Face is to Classic Strange when Furnace Face isn't getting himself nerfed. Maybe a little less-so, I don't know.
So, how does Strange stack up to Kilowog? Is he 'really far above' Kilowog.
Strange, in a fight, can actually take it to the Surfer and win. He doesn't need help messing with stuff on a planetary level; instead, he does stuff like turn back time, solo, on a planetary scale. He doesn't pluck spacecraft from black holes, he actually messes around with the black hole itself.
If Kilowog is capable of actually beating up Clark, then we're in an area where he can at least put up a fight against Classic Strange. I don't know how long he'd last, but he could put up a fight.
Against Ganthet, Kilowog doesn't just instantly fold. Clearly he's kind of hanging in there.
...this doesn't exactly match up well with Ganthet kicking around most of the Green Lantern Corps, solo, when injured. So...hm.
It's sounding like he might have the edge on Stephen in raw power, though not to the same extent that Furnace Face does when he's on his A-game. If that's the case, he'll take the first fight after a hard fight, but the second is going to be serious trouble.
But I wish we had more feats for Ganthet.