Re: Okay, I haven't thought about this since I was 12 but here goes...
No no, I WANTED him to be Degaton. But this is what they have.
I'm pretty sure they stated at some point he was a Controller, and at least as far as they've been shown in Legion comics, apart from size this is it. And that could be explained by his being drained of power here. And this isn't, like John Broome or something: this is Levitz/Giffen, so as far as I've seen from Johns' taste, this is his preferred canon.
Now, granted, even that Legion has been through a couple of overwrites(the science to magic and back again thing that happened around the Crisis) which I believe were the Trapper's doing, but anyway...
Oh, and those guys swathed in darkness in the background of the last panel? Evil duplicates of well-known heroes(including Superboy & Orion) stealing energy for Darkseid. That and the Daxamites resculpting their whole planet into Darkseid's head is one reason today's apocalyptic comics events don't impress me as much.