Eh, in that case Low 2-C can still be reached as the timeline was stated to also be potentially affected via what´s at the OP (3-A + time = Low 2-C)
And it´s worth to mention that the
Ultimania Entry (which is at the OP) states that:
"Kingdom Hearts"
"A condensed form of the hearts of this world. Also known as the kingdom of hearts or the center of worlds. It also is the source of great power and a source of endless knowledge."
Now, then...
"
Hearts"
"In the world of Kingdom Hearts, not restricted to just people and animals, but every
existence contains a heart. The collection of all kinds of hearts would become the great heart ― Kingdom Hearts."
Considering that each "World" containing its own timeline was accepted, combine that with the current 3-A reasoning, and you get Low 2-C, aka, something like this:
"Low Multiverse level (Is comparable to
Sora,
Donald and
Goofy, who can keep up with
Xehanort while wielding the true
Kingdom Hearts alongside the
X-Blade, to remake the entire universe (which contains multiple timelines within itself) in his image and cover all the worlds in darkness)" (Only affecting the "current" 3-A rating nearly everyone has.
- A rough basic template for the (potentially) affected profiles that aren´t, well, Sora, Donald, Goofy or Xehanort.