The only reason Chaos Force is 5D is because it exists on a plane beyond space-time, which we know contains infinite alternate universes. It's basically a classic case of a character transcending an infinite universe, the difference is that we know that Ancient Walkers, Knuckles and Master Mogull have become one with the nature of Chaos Force, so that's why they're 5D.
But disregarding this transcendent nature of space-time there are other feats to see.
Nearly all low 2-C feats in Sonic are very casual and made as a consequence of actions like a fragment of an emerald of chaos falling to the ground and creating an alternate universe or Super Sonic and Hyper Knuckles destroying a Special Zone. The only one that is not very casual is Dr. Eggman restarting his universe with an emerald of chaos, but in the future it is explained that this is only the minimum that could be done and had potential for much more.
The 2-A on the other hand are much more common.
In SS7 Dr.Ian Droid (Planned to be an alternate version of Dr. Robotnik from another universe, but the story in which this would be revealed was canceled because ... Ken Penders...) would use the emerald master to destroy infinite universes and then creating a new universe only controlled by Dr. Ian Droid. And this indeed does occur,
Dr. Droid manages to finalize his pla.
However Knuckles utilizing his contact with the power of the Master Emerald was able to restore the multiverse to the way it was before.
Also has the destruction of the Multiverse made by Master Mogul and reverted by Titan Tails.
And finally, virtually all of the Worlds Collide Arc has mentions of 2-A feats.
The beginning by itself is Dr.Eggman and Dr.Willy restarting their universes, this in the future was revealed to have affected the future of Silver and Blaze universe as well (with the participation of both in the crossover). In his forum Ian Flynn explained that the two actually rewrote all the universes involved with Sonic and Megaman, which are infinite.
In addition there are also other mentions that with the seven Chaos Emeralds it would be possible to rewrite all the worlds, not only those of Sonic and Megama. Possibly referring to what would be revealed after in fact there are other sets of universes that are not related neither with Sonic or Megaman.
And of course, there is every reason why the reboot occurred where Chaos Control (Super Genesis Wave) destroyed everything related to the old Sonic Continuity like Sonic Multiverse and the old concept of Chaos Emeralds - the whole physical manifestation of Chaos Force and embodiment of all the magic thing - (Except for Sonic, Eggman and Blaze that for some reason were affected by the rewriting only after it happened).
So even disregarding the whole subject of Chaos Force transcending the space-time of Sonic's multiverse, there are still plenty of 2-A feats (Even Mogul profile have two 2-A feats that directly scale to him - that is his Multiversal Destruction and the Master Emerald "crisis in infinite earths" rip-off).
I'm planning to revise all the Archie Sonic Franchise in blog format just as I do with Digimon, but I'll do it only when I finish doing Digimon blogs that I've planned (End the Digital World and Digimon Biology Blogs and start the blogs about God and Host Computers. At least these are the most important ones right now.)
