Star shouldn't scale to the current Shigaraki or All Might prime
They literally scanned shigaraki's power and instead of saying "Wow, he's almost as powerful as All might at his prime" getting a chance at such a mention, they just said "He's superior to AFO on Kamino"
Shigaraki is now "as powerful as All might prime" not because of his physical improvements, because according to doctor Ujiko himself he could not improve it much more or shigaraki would become a brainless nomu, (which are not much stronger than weak All might) but because his body had to adapt to the singularity as soon as he got 100% AFO
No matter how small the percentage is between 98% and 100%, what differentiates it in power between before and after is the consequences of Shigaraki's body adapting to possess 100% by the evolution of the singularity, not having 2% more than before
"You're just guessing, you have no proof other than the mention of him just being superior to AFO kamino"
Quite the contrary, just think for a second:
The semi-high end that was with shigaraki was able to withstand a blow that hurt him, (star's applause) so that semi-high end was at least close to shigaraki in durability
Is for some reason that specific semi-high end, which should be incomplete compared to others like hood, for some reason close to the power of All might prime?
And if the answer is "of course, why not?"
Is CURRENT WEAKENED ALL FOR ONE, someone who withstood multiple attacks and physical blows from endeavor, who could hurt Hood, who should be better than the Semi High End, comparable to All might prime?
Does that mean Endeavor, whose entire narrative revolves around never coming close to All might's true power, comparable to All might prime?
... is All might kamino, who beat an all for one slightly less weakened than the current one, and repeated multiple times that he is much weaker than before, comparable to All might prime ?
You could really think that all this makes sense just by trying to apply mentions made long after the Star fight, who also claimed to be weaker than All might, being that the best publicly known feats of All might are those of making storms and those of kamino , made by him being already weakened ?
bruh