About the Dark Area, this is really being revised. That doubt is not only about Digimon's cosmology, but about how the stories are conceived. The truth is that as Digimon is a franchise that goes through the hands of many people, contradictory ideas end up being put within the same story, and this often makes it confusing how things should be analyzed within a vision directed to a website that aims to index the characters status. There are things that simply should be considered plotholes without explanation so that it makes sense within a larger vision within the franchise. So the new blogs are taking a long time to come out, I'm reviewing all I can about Digimon's own history as a franchise to be able to define how cosmology should work and how to put it on pages in a way that it can still be consistent with the big part of the storyline.
Currently I think it will make a lot of sense to put the Digimon with two versions per profile. One for the original nature of the Digimon as transcendent beings that exist in a Platonic conceptual world and another for the physical form resulting from distortions in space. So we can have both the statistics relating to the abstract side of some characters and the more "physical" side. However doing this would generally lead to doubling the number of keys in each profile, so for this I'm planning on revisiting all of the Digimon pages on this Wiki to see if the profiles can be narrowed down and make it simpler to explain. (To be honest, at that point a page about "Digimon Physiology" could greatly reduce the content on the Digimon page and facilitate the understanding of what is in it).
I can only guarantee that after the Blog the situation of the Dark Area along with "infinite speed" will improve a lot (Even more considering that this can be changed to simply "Immeasurable".)
On 4-B, I still do not understand for sure why to be 4-B. The Digimon feats are constantly Tier 4 for characters close to Perfect or higher (Wendimon, Starmon X-Antibody, DarkSuperStarmon, Metal Greymon, Chaos Etemon, Sephirothmon, Gerbemon, Datamon, etc.) and although it would make sense if these made from File Island's Digimon to scale to Folder Continent, but that's not the case. The feats of virtually all of these characters are from after the Digimon Pendulum and the few who still have versions of File Island ... were not the ones who performed the feats Tier 4 (Like Digitamamon and Etemon). I also think that I'll revise that power level.
Speed I'm still not sure, I think what is missing is a larger amount of Digimon with feats of that level to have profiles to justify the speed of the characters. Overall, I believe the Tiers of all Characters from the Perfect level and upwards will be revised (especially Tier 2) as well as speed.