First, there's a reason if we decided to split the timelines (Midway and Netherrealm's) into two different canons.
MK writing, especially after Netherrealm took over, is simply asinine, and the new studio (comprehensibly tbh) wanted to create their own series, and used the time-rewind just as an excuse to reboot everything.
It's blatant how the Midway and Netherrealm timelines don't match with each other in terms of characters, events, cosmology and many other things, aside from whatever could be attributed to the small changes enabled by Raiden messing with time.
For this reason it doesn't make sense to use statements from MKD to scale concepts introduced 15 years later in MK11.
Writers and producers stating different things on Twitter and interviews is also nothing new, iirc there were some tweets from Ed Boon in which he stated the realms are solar system-sized.
As I always say, one day I will get to work on Midway MK, the job's just too big for me to handle in any foreseeable future, and it can't be fixed by a few CRTs that patch together some scattered pieces of information, unfortunately.
My proposal will always be to never connect the two, and scale each other's cosmology only by what is shown and told in their respective canon. For example, considering the One Being as having two different keys.
Also, the powers granted by the Hourglass don't scale to physicals nor even actual AP, it's just Reality Warping-Time Hax, with the Crown working more like a remote control rather than a battery.
Btw I've been wondering but why did we remove the shaking earth to its core feat from raiden?
This question pops up every three months or so, the feat wasn't canon to begin with (as it happens in a bad ending) and the shaking of the Earth to its core is still described to be the result of Raiden and Shao Kahn's battle, which went on for who knows how much time.
To qualify as a tier 6 feat, the Earth should have been shaken to its core by a single blow delivered only by a single character.
Also, there's still the possibility of it being hyperbolic flowery wording meant to convey the idea of a great clash.
Also shao kahn merging the realms with his power.
That's just fusionism magic, there's nothing indicating it scales to physicals or any other attack. Also, the old games describe the process as happening overtime.
The whole "Titans > OB" is still questionable at best, it could also simply mean that Kronika plays the puppeteer part by rewinding the timelines beyond the Titans and the OB's ability to interfere.
Also, we must take at face value how the Titans are a recent and badly/scarcely explored concept to add additional steps to the cosmic hierarchy. Kronika herself wasn't so much strong due to her own power alone, but rather because of the power of the hourglass.