So,fresh Luffy is currently the strongest until Fatbeard gets his Zenkaiboost?
Luffy will ultimately beat Kaido while more "nerfed", so yes he is stronger, but to beat Kaido he will show more trump cards which show his insane prowess. Injuries and fatigue moreso effect stamina, than output anyway, so the nerf Luffy is facing is just an artificial time limit, rather than making either side weaker.
Blackbeard without fruits was already Shanks tier when
serious, just like BM and Luffy he isn't serious very often.
He now has two of the most powerful fruits in the verse, of course he is the strongest.
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Luffy recovers from eating and had a shit load of meat and drink
Making all the above irrelevant
Yamato says otherwise, making your post irrelevant.