chosen by one for all

what if after all might crystallizing the power of ofa, it's gain and share a small conscious of all might to chose its own holder. but when all might chose Deku he refuses saying that he don't need his power to become a hero and especially after all might crushed his dreams but unknown to both of them ofa already chose Deku and transferred into him with a touch and settled in Deku, both don't know that the transfer is already done so continues their daily life.

what gonna happen when Deku finds that he has ofa and it's not leaving him even he willingily giver it to mirio, what's he gonna do.

in first please why izuku decline the offer to gain power, and how izuku get in ua without a quirk
but most importantly why katsuki is afraid of Deku who he bullying until two years ago. and why is Deku is angry and cold to the people he don't see as his friends.