Can't believe I didn't put it together. If AFO wasn't at the bar and there are two bases…
We got a healing AFO and a weakening All Might, gonna miss you All Might.If All For One sees/search Deku won't he instantly know he's All Might successor? Uh-oh.
If AFO watched the tournament (and we can guess he did) he already saw Deku using All Mights' quirk.
Rest of the characters in the manga not realizing that by now is due to silly superheroe cliches like "no one would recognize my real identity with these glasses"