Midoriya Izuku can already use Shimura Nana's Quirk

In the Boku no hero Academia Story, we know that Midoriya izuku (Deku) got a new power from Quirk One for All that he had and that power was given the name blackwhip which is Quirk from the owner of One for all Number 5 namely banjyo daigorodaigoro

  Despite gaining that new power, Deku could not fully master it from his new power and even when it was first used, Deku almost lost control, but before getting the power of the blackwhip, Deku actually has a power that he can control quite well namely the power of the owner of the 6th One For All is Shimura nana who is also the teacher of All Might

  In Manga Boku no hero Academia Chapter 257 it is explained that Shimura nana has a Quirk with the name Float that can make her float, and from that we know the reason why Shimura nana's costume has a robe, it might adjust to the Quirk she has that can make her float

  Then to prove that Deku mastered Shimura nana's Quirk, we returned to the Deku Fight against Chisaki, at that time I already used 20% of the power of One for all, then during the Final battle against Chisaki, Deku who carried Eri at that time, could issue 100 % One For all's strength without getting hurt

  From that fight, we are presented with a very exciting fight in the air between Deku and Chisaki and from that fight we can see that Deku can bring out great power in the state of floating in the air though, this of course proves that Deku was able to master Quirk at that time. Shimura nana's without knowing it

  Then I fought against Bakugou after completing the temporary licensing exam, in that fight Deku would almost win against Bakugou but in the climax of that fight, Deku and Bakugou dueled in the air and Deku could compensate Bakugou who was an expert in the air fight but in the end Deku lost the duel. and at that time Deku exceeded the One For all power limit, which was originally 5% to 8%

  That shows that after Deku has passed the 5% power limit, he managed to get Quirk from Shimura nana and because the power is still small, it makes the Float Power not very visible but when the fight with Chisaki, the Float's power is clearly visible.