Yasui
It was, it's the reason he could brake kabuto's control of him when he revived all those shinobi during the war
Kreeezyyy:Shisuis other eye was prolly put in his crow summon
Things yasui can do : 1- Become a jinchuriki for three tails or 0 tails 2- Study fuinjitsu 3- Exchange one of fugaku eyes for shisui eyes 4- Chakra control 5- Practice Genjutsu , taijutsu , ninjutsu and kendo 6- Search scrolls in uzushiogakure or in the senju clan 7- Steal hashirama cells 8- Search for a unique summoning scroll 9- Buy a paper to know his elemental affinities , in case that he can awaken another kekkei genkai or kekkei totta 10- Go to the stone of galliley (the meteorite of naruto) and find a way to eliminate the radiation and extract that chakra 11- Go to find juugo or his clan to steal blood and experiment to find a way to absorb nature energy 12 - Find the sword that suits him the most out of the swords of the 7 swordsman of the mist