It's already been known that Tomura got stronger without his Quirks.
It was Garaki's enhancements that made Tomura Prime All Might level. However, Jaku Tomura was incomplete and was getting stronger. By taking the first two battles into account, the heroes predicted that Tomura would reach Prime Might level by the final battle. Nobody said he was Prime All Might level in the past.
Izuku's gauntlets taking the punch means nothing when 45% Izuku was weaker than Tomura, and the gauntlets he has in the Final War Arc are even weaker than what he had in the Dark Hero Arc. You can never make the gauntlets work.
The doctor only says he's not as strong as All Might. In fact,
I'm looking at the raws, but it seems like he's just saying Tomura is strong, but isn't equal to All Might.
Anime Subs: "Even though he's got super power, he's not as strong as All Might."
Shigaraki goes from not being on par with All Might to being on par with All Might by the Final War Arc. He clearly got stronger. All For One even states that Shigaraki's potential surpassed his and Garaki's expectations during the Star and Stripe's fight.
I think the issue is that the Prime All Might level was probably not meant to be 60x stronger. As the gap isn't meant to be that enormous. I still personally believe Rewind AFO should have some scaling to Prime All Might level, and that same AFO stated that Endeavor was the only one in the group that could reach him as he was in that moment.
100% Izuku in the Jaku Battle wasn't able to one-shot a Quirkless and weakened Tomura. Tomura, after he realized his body was incomplete, stated that the power Izuku had would still be a hindrance to his dream even if his body was completed and uninjured. And I don't believe Izuku made OFA that much stronger in that timeframe.
By the Dark Hero Arc, it's not unlikely that Izuku and others now understand All Might's strength fully.
There is a big gap, as even Plus Ultra All Might was inferior to Prime All Might, yet I don't think it was meant to be blitzing and one-shot level.
This is all my personal opinion, so who cares what I say. Feel free to disagree with me.