Make what conclusion out of what you will but the only personality trait Mitsuki has shown is a deep knowledge for Konoha. He sees his classmates as stats, heirs, abilities and clans. What do you think the reason for this is?
The current villain possessing people's bodies in Boruto: Next Gen also has made a habit out of talking like this, explaining Shikadai's own jutsu to him in detail shows an ominous but unmistakable interest, Metal also took on Mitsuki's glare and the villain involves snakes. Considering the series has limited time to install Mitsuki into the main cast, this is almost definitely the way they're doing it.
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The current villain possessing people's bodies in Boruto: Next Gen also has made a habit out of talking like this, explaining Shikadai's own jutsu to him in detail shows an ominous but unmistakable interest, Metal also took on Mitsuki's glare and the villain involves snakes. Considering the series has limited time to install Mitsuki into the main cast, this is almost definitely the way they're doing it.