Kizaru did not want to expose his identity to too many people for the time being. After his physical clone located Yamato and the others, he did not appear directly, but instead relayed the situation ahead to Yamato via telepathic transmission.
Upon receiving the warning from Kizaru, Yamato decisively signaled his teammates to halt their advance and informed them that someone was lying in ambush ahead.
As seasoned Jonin, both Might Guy and Yamato would not choose to lead their squads into danger at such a time, so they decisively opted to change their route.
Among these two ninja squads, it was not only Yamato who received Kizaru's transmission, but also Sai, whom Danzo had planted in Team 7.
By now, Sai had developed genuine bonds with Naruto and the others; deep down, he was unwilling to reveal the squad's location to Lord Danzo.
However, helpless against the pressure from Danzo and Root, he could only obey orders, at most withholding information regarding certain details.
For instance, when sending messages to Danzo, he did not tell him that they had all traveled to a parallel world, but merely claimed they were trapped in an alternate dimension.
Kizaru had warned Sai via transmission not to leak his identity to Danzo, and told him that before long, he would no longer need to worry about Danzo's threats.
In the parallel world, unlike Naruto who had people looking out for him, Sai had spent most of his time diligently collecting various public intelligence, which included quite a bit of information regarding Kizaru.
Among the intelligence gathered, whether it was Kizaru's strength or his past deeds, they were all of a monstrous, terrifying level that Sai had never heard of before.
Faced with a transmission from such a powerful Kizaru, Sai naturally chose to