But most of the time, unlike that summit arc, danzo removed his bandage to use Kotoamatsukami on Tobi in Sasuke's fight and itachi was caught by looking towards naruto so I think it requires some sort of visual contact, even if it's just body contact; to initiate KA considering the fact that Danzo's bandages had holes or openings in it, he must have seen through them even if slightly. So I think gaara's sand would be effective considering the fact that it has chakra and physical energy or life-force in it, considering it contains his mother's will. So the physical energy could most probably block out the penetrative vision of the sharingan or MS. Like tobi's mask cannot be seen through because it is made from hashi cells. But KA has the chance of catching the third eye and in turn manipulating gaara who is connected with the eye, and not only that, shisui has various other illusions which made danzo use izanagi in the itachi novel(dunno if that's canon). Shisui's taijutsu would be around 6th gate lee level in the least, enabling him to break out through the sand considering he equalized in taijutsu fights with itachi in his young age, who was considered above eighth gate level by guy who admitted inferiority to him when he returned to konoha and the last time itachi was seen in konoha was 13 year old so 13 year old itachi had above eighth gate taijutsu so shisui probably breaks through the sand armour. Gaara levelling the field and using the hardest minerals from the ground to make a hardest pyramid and sealing it with shukaku sealing jutsu could give him the win, but I wonder if he could do it in time, seeing shisui has the speed of a teleporter with shunshin jutsu because he was called Shisui the teleporter.