I am
EXTREMELY SORRY for bringing this again (spoke with Ant and he gave me the ok), but I have found a major issue that makes this CRT pretty moot and shoots it to the ground (outside of Range, it being 2-B is still ok).
I do not think anymore Galeem is 2-B because of the fact that
after both his and Dharkon's deaths, the spirits are shown to return to their home worlds after being freed, and
they specifically use a portal, which would make no sense if Galeem destroyed all the universes except of one, with another major contradiction
is Galeem still nuking the universe in the bad ending despite
his intention of making his own world.
I remembered of this detail only today, so I am sorry for any inconvenience that this caused.
If you're ok, everyone who was upgraded to 2-B will return to be "3-A, likely Low 2-C", with Galeem and Dharkon still having 2-B range. It's like
Heaven Dio who despite clearly having 2-A range, his destructive power can be mostly condensated in a single universe.