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In my,opinion since Boruto is 100% Otsutsuki and Momoshiki can’t comeback to live with his body it means that he’ll stuck in his body aswell now this doesn’t mean by anything that they’ll have a connection like Kurama and naruto in fact it’ll be like Sukuna and Itadori since we saw that Boruto didn’t sleep for a long while because he was scared of Momoshiki taking control of him and hurt his family now that's the point Momoshiki can’t come back to live but he can take control of Boruto’s body again so that means thar Boruto life will be ruined since if Momoshiki takes control again he might kill his loved ones or hurt them and that's worst than seeing them being killed so basically that might be one the parts where Momoshiki said he’ll loose everything now i had more things but lets go onto the jougan,now the jougan(pure eye) was mentioned a lot and it’s also known as the(evil eye) now that eye has two sides since Toneri and Momoshiki had different prospective from it one said:once the eye comes the light of hope will spread aswell (iirc what he said but it had the same meaning as this) on the other hand Momoshiki said:once his blue eyes takes turn he’ll loose everything aswell,well the jougan (pure eye/evil eye) irl has to sides aswell there are those who says it reflects bad and evil things from the one who has it one says its the eye that brings destruction’’iirc’’ and there is the Otsutsuki god who has millions of the jougan so imagine the power of that eye and there are two other otsutsuki’s left to discover cause their horn symbol’s were broken when we saw them as for them I don’t have alot to say since we don’t have great details about them that's my theory and also I skipped some things to try and make it short .
