I always find it kinda funny when people say that Lord English is just as smart as Doc Scratch/has omniscience. He is shown to only be smart enough to use the most straightfoward use of his powers, time travel. If he was actually intelligent he'd just tell reality that right now was the point in time in which all universes and multiverses experienced heat death and reality would buy it.

It would seem that the Soul Merger that is Lord English did, indeed, separate into the more Omniscient and intelligent Scratch, and the more Caliborn-esque Lord English. In a way, maybe English sees Scratch as everything Calliope embodied- Smarter than him, using her weapons, Space-bound because of First Guardian powers… So he delights in coming to life time and time again by shattering through him.