You havent done him any justice at all :sy:
Shisui is like a combination of itachi and minato.
His 2 nicknames alone should tell you that he mustve been a formidable opponent. He was hailed as the best genjutsu user of the uchiha. Personally i believe itachi has surpassed him. Secondly many of the extremely fast ninja's user shunshin in base. Examples are minato, itachi, A, sasuke and shisui got a nickname for being the best shunshin user.
2 nicknames which suggests that he mustve been very special and tbh since it was said that he was like an older brother to itachi, it would make sense to say that thats where itachi gained his genjutsu prowess from.
Anyway 2 hyped up nicknames along with 3 ms techniques. One which is so op that not only did kishi put a 10 year ban so to speak on it, he also made sure that danzo didnt have this when he fought sasuke. Funny enough its so op that both eyes were destroyed for precaution. Id like to know more about his other 2 ms techniques, but also why he got his 2 nicknames.
Also danzou didnt take his eyes. From what ive read it would make sense to say he gave danzo one eye, no different to how he gave itachi the other. Shisui i believe was part of anbu and basically believed an d had the same ideology of danzo which is to protect the village from the shadows therefore it makes sense that he would give his superior one eye. Also lets be serious danzo before he gained all those shairgans was nothing special, shisui's hype would wipe the floor with him. Secondly if danzo reall beat him, he would take both eyes, and not just one. Its obvious that he gave one to danzo, the same way he gave the other to itachi. Both in the aim of protecting the village