The main point is that Bro and Mom are paradox clones of themselves, and thus so could Cal be a paradox clone of LE.
He could be. Or maybe I've been thinking of this the wrong way. For the cherub cloning session (which there has to be at some point for cherubs to exist) we have two options:
Lord English is paradox cloned to produce Caliborn/Calliope, who then becomes LE. I don't see this as likely.
Lord English, the adult form, is a breeding clone, specifically the type that involves a code in addition to it's paradox sample. We know that Doc Scratch was, but we aren't sure whether or not Lord English was - he could have merely used Doc as a gateway to entering the universe, rather than having actually been created inside him. Still, it's possible.
Lord English is a mutant clone. He's not actually involved in the Paradox process directly. Like a breeding clone, but only requires one source. He could be a mutant clone of Caliborn/Calliope, assuming they only have one genetic code anyway.
Lord English is a proper breeding clone. He is what you get when you mix a paradox clone from Calliope and Caliborn.
Alternatively, Lord English could be a paradox clone of Lord English. The whole Calliope/Caliborn thing is a big ol' Red Herring. Rather, Calliope and Caliborn are breeding clones created from Lord English... somehow. Of course, there's nothing to mix Lord English WITH, so this doesn't seem to make much sense.
Regardless, we are going to need to have a Cherub ecto-biology session.
From what we've seen of his nature and abilities, I'm leaning on him being a breeding clone of one sort or the other. Despite him clearly being dominated by a Caliborn-specific brand of behaviour....
Oh.
Oh fuck.
I think I fucking figured it out.
Guys, what do English's eyes look like?
Who else has now had eyes that looked like that?
What did it mean?
Lord English isn't the bad guy. But Caliborn IS.
Maybe, just maybe, Caliborn doesn't HAVE the ability to travel between realities.
What he DOES have is the ability to make ectoclones of himself and calliope...
and the ability to possess people, through his juju.
Lord English isn't the bad guy. He's not even a real lord. He's just... a puppet, dancing on a string.
Wilder spec:
He might even be replaceable! He might have been made multiple times! And killing him, well... it might not accomplish anything at all.