Were the 9 tails statues in Naruto legit?
Actually, I think it was a self test for Naruto. Bee was smart, and even though he believed in Naruto (that bump fist thing) he needed to make sure that Naruto wouldn't use that Tailed Beast power for ill purposes. So, he told Naruto to insert his head; if Naruto had hesitated because of those ill-deeds in his mind, Bee would've instantly stopped his training.