Before I become unable to contribute, my two cents.
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Mechikabura is a literal living multiverse"
Other people have covered this already so I won't go in-depth - Mechikabura is powered by the multiverse, he is not the multiverse itself.
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Demon realm exists outside the flow of time and regular physics"
The Chronoa scan shows the Demon Realm being
placed outside of the flow of time (ergo, it's not normally like that) and the other scans are contradicted by the fact that the Demon Realm is confirmed in the same manga to have a time scroll. (Also, Xeno Goku and Vegeta regularly use Super Saiyan 4 outside of the Demon Realm, so the whole idea of the form damaging time appears to have been immediately abandoned). This also says nothing about the realm being outside "regular physics".
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Crack of Time exists outside the flow of linear time"
Surely the fact that Demigra was in there for a linear amount of time confirms that the Crack of Time isn't itself timeless, no?
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Time patrol fighting multiple Demon Gods"
And?
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In Xenoverse 1 and 2 the mentors, who are in Toki-Toki/Conton City, can sense you and freely fly to and from you in alternate timelines and time-frames. Several are villains and have no teleportation, and all are shown flying in and out of the battle, so the arguments of them using time patrol tech or teleportation are moot."
Not so, in-game lore answers this - Skid in Xenoverse 2 explains that they use modified Time Machines to enter those timelines.
If you're wondering why we use a time machine to enter Parallel Quests, but scrolls for other quests, then let me tell you. It's because the history for Parallel Quests is different from the history that's stored in the Time Vault. It might be easier to understand if you think of it like a bunch of digressions and sidebars that have spun off from the main story. The long and short of it is that we can't access that history using the scrolls, only with a time machine.
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Here we see that because the time breakers (this includes non demons like Bardock) are disconnected/removed from time, the fight you have with them will not effect history. This implies also that you will not effect history either with your presence and are outside the normal flow of time like them, which is the case since you can enter and interact with historical DB events without changing them or making more timelines, to get rid of the time breakers and anomaly's."
Again, being "outside the flow of time" isn't literal - it means they aren't past of that history, because that's how time travel works. You also
do affect history, that's why the Parallel Quests exist in the first place.
Are you the Patroller who's on the critical mission? Everyone's talking about you! You know the great hero? But if you look very closely at each of the changes the hero made, you'll find slight imperfections in history. That's because those interventions were made by someone who never existed in the original timeline. Because of this, we can detect tiny fluctuations in history. That's why we have Parallel Quests. We can keep trying again and again to fix history completely, but we only ever get a fraction close to the correct version.
Also for the record, it's been shown that the Time Breakers/Dark Empire members who can't teleport, use technological means (the Time Breakers have a Time Passport/distorted Time Scroll, and the Dark Empire have spaceships) to time travel.
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The 7 Shadow Dragons fly across time and space to all the ages and missions in the DBH world, and are even about to enter the real world. Beat and his friends can react to them as they pass by as well. Note that Beat had not even obtained SSJG yet, and is still on their level showing even mid tier DBH characters have such feats."
The dragons themselves aren't about to enter the real world, the negative energy they give off was. More importantly though, your only evidence actually showing that is from an opening, and they notoriously don't reflect the actual game.
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The Demons such as Towa and Mechikabura can perceive and track the Dark Dragon Balls as they fly off to alternate timelines, and it is outright stated that Mechikabura's power and youth would be difficult to restore, and take time for the Dark Dragon, implying it is a huge feat for him, unlike casually dispersing the Dragon balls across time. We also know with other instances such as the Shadow Dragons flying through both time and space, the patrollers could fly alongside the Dragon Balls as they dispersed. So the flight capabilities of the Dragon Balls likely scale."
They can't track the Dark Dragon Balls themselves though - we get the most solid proof of this during the game's version of the Dark Broly Saga, where both the Time Patrol and Dark Empire have to spend time searching for the final Dark Dragon Ball. We know the Time Patrol are detecting the people merged with the Dark Dragon Balls (and most of the time it's the Dark Empire they're following) and it's likely the same for the Dark Empire.
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Demigra is stated to "Transcend Time and Space""
Already covered this, it
is just due to time travel. He's travelled back into his own past before, he clearly has a linear timeline.
So no, regardless of any wider debates, they shouldn't have immeasurable speed.