Naruto interrupts Sasuke. He gets upset at what he is doing, Chocho is with him. Sasuke explains that he know it is Sarada but he wanted to make sure she is not a illusion or a manipulation set by the enemy.
The reunion was not how Sarada wanted things to go so she remains in shock and in tears. Sasuke and Naruto speak into another room.
Sasuke explains to Naruto that his mission was to find out why Kaguya wanted to build an army, the sharingan eyes Obito had kept seem to be in the hand of the one who is leading Shin. Also, the white Zetsu(s) kept in the room could have gotten their hands on the sharingan which is a possibly a product of what Shin is. (not sure about this)