There is no distance or anything at all..
All of them are four-dimensional structures and are equal. We are not talking about structures of different dimensionality, such as a difference between a 4D structure and a 5D structure, where you could argue that the distance is indeterminate or that multipliers should not be applied. In that case, I would understand the argument.
Let’s assume your power is 20, and with that power you can destroy one planet. Then your power becomes 40, and naturally you would be able to destroy two planets, and so on. This is what is called a logical, real-world scaling balance. You cannot place 50 kilograms on one side of a scale and 50 kilograms on the other and expect it to tilt—because that is impossible. This is the principle of equilibrium in everything.
If a character with power 50 can destroy, for example, one 4D structure, then if they reach 100 they should be able to destroy two universes, or possess power equivalent to two universes combined (since both are 4D, there is no strange gap or distance between them anyway).
Don’t you find this strange or even somewhat funny?
Goku in the final saga—I think the Buu saga, or I forgot its name—was at Tier 2-C, and he was already in Super Saiyan 3 before the events of Super. In Super, his power multiplied billions of times to the point where even the weakest characters now, like Krillin or Goten, could defeat all Z-era characters.
So how does his power multiply billions of times over 2-C, while he still operates within six universes?
The Angels are across six universes, the Gods are across six universes, the Grand Priest himself is across six universes, and Goku and the rest are also across six universes. Everyone is within the same six universes, and the weakest angel can erase them all with a finger snap.
The Grand Priest can easily defeat all angels, gods, and all characters effortlessly, yet he is still within six universes. This is something that does not even make logical or rational sense. Even here, Zamasu Infinite is treated as stronger than the Grand Priest, which directly contradicts Dragon Ball itself, which states that the Grand Priest is the second strongest character.
Frankly, there are many errors in these classifications. Everyone should at least be Tier 2-B, and the Grand Priest should be 1-C based on being the second strongest character in Dragon Ball. Placing Zamasu above the Grand Priest is a direct contradiction of Dragon Ball itself and the author’s statements.