With his adaption and absorptive cells there's no way to know what powers Doomsday would have had by the time his remains impacted Earth in Young Justice or what the effects of combining his DNA with other creatures like possibly martians or other aliens might have had.
Doomsday adapts to survive, that's the point of his shtick.
For a telepathic hivemind to help him survive, there must be more than one of him. There's no advantage to a telepathic hivemind with oneself.
So if the doomsday guess is right then you guys are underselling it.
It's not doomsday, it's doomsdays.
Inspirations from the comics- Darkseid having Desaad clone him an army of doomsdays. In the comics, Darkseid encountered Doomsday 245,000 years ago on Bylan 5, where Doomsday killed Darkseid's uncle, and Darkseid fled for his life. Perhaps in this fic he left with a DNA sample.
Reign of Doomsday- 4 doomsdays, no waiting. It's unclear to me where exactly the extra copies came from. Lex Luther or Sam Lane's project commit kryptonian genocide perhaps?
In New 52, Superman killed Doomsday, only to be infected by a disease that is turning him into Doomsday.
The evil superboy doppelganger Black Zero collected himself a bunch of Doomsdays from various realities.
Yeah, I get that Doomsday is scary, but he's only really scary when you insist on engaging him in the Face Punchy sort of way. Assimilation only needs to work once and he becomes a non issue.
In the comics, Doomsday slaughtered his way through the Green Lantern Corps and killed a Guardian. If that incident happened in this setting, I doubt a mere change in color is going to impress him much. The Guardian believed that Doomsday was draining him of energy.
