Hi, I was asked to respond, and I agree with Rex here. I don’t know the purpose of using a "possibly" rating for no reason. If fatalities aren’t "accepted to be valid" or we consider them all "non canon", why would that warrant a "possibly". And if we accept fatalities within reason as valid for scaling, based on the type and abilities used, why would a "possibly" make sense there either?
I'd prefer using fatalities as a representation of the level of the canonical abilities used by the character who did them provided. This would be contingent on their already existing abilities and if they aren't heavily contradicted. Using Cyrax's self destruction as an argument against fatalities is weird when one its a gag, and two, we also are given a statement about it having a range of a few miles. I am not saying to always use the highest fatality calculation to scale the weakest characters, especially if they have no rationale to scale to the person who did the fatality. In other words, it’s still based on scaling from the character who performed the feat.
Also, looking into it more, I think using fatalities to scale is still astronomically more reasonable than using Test Your Might. Out of the 8 Midway Main Titles, only two of the games have this minigame in a form similar to what the calc uses [MK1, Deadly Alliance]. MK vs DC has Test Your Might as well but it's a very modified form. So are we fine with scaling all of the Midway characters from a minigame
only in 1/4th of the games, that can be failed? Also, I should note that currently those who scale to the minigame, all scale from the maximum,
because only the diamond breaking is 9-A. For context, by the time Shao Kahn, Shinnok, & Quan Chi had appeared, it was not present in the games, yet this is where everyone is scaling from.
That makes less sense than accepting fatalities in some form.
TLDR: If we collectively decide fatalities are not reliable, Test Your Might is still the worse alternative, and [in my opinion] less valid.