People's physiques couldn't be lumped together. Yuhime Torune was also a rather special case within the Aburame Clan. Simply put, he raised nano-scale venomous insects, so he wasn't suited for any activity involving competition... Unless it was an activity with exceptionally strong killing intent, whose sole purpose was to send one's opponent to reincarnation.
Although the joint exams were highly confrontational, they were still, in essence, within the scope of an "exam." What was an exam? That wasn't difficult to understand. Even Naruto could figure it out.
However, Naruto clearly hadn't thought things through when he didn't ask Yuhime Torune to join this operation. For one thing, Torune was different from them. They were genuine kindergarten students, while Torune, being two or three years older, was technically an elementary-school student mixed in with the kindergarteners. They belonged to different age groups, so they had far fewer common topics. For another, Naruto only knew that if Torune were called along, they wouldn't have to do anything afterward. They could just watch Torune perform.
In short, after the four of them discussed their countermeasures, they headed straight for the Chunin Ninja Exams venue. According to Naruto's plan, he transformed into Yuhara, while the other three disguised themselves as his attendant ninjas. After displaying their important medals, they encountered no suspicion from the guards and were allowed straight inside.
Those ninjas simply assumed that Yuhara had come to inspect the progress of the exams.
To be honest, they couldn't really be blamed for lowering their guard. Outsiders might impersonate Yuhara, but they absolutely couldn't obtain one of the high-grade medals, of which only a few had been issued in total. As for people inside the village, who in the village would impersonate Yuhara?
Besides, Yuhara really didn't have the habit of wearing his