you are full of BS....it was Kurama who decided to lend naruto his chakra with his free will,,against Madara
It was a choice, Naruto already took control of Kurama, he just wanted Kurama to fight with him. He can always go with the power of sage and pin down Kurama when ever he needs the chakra, but he is not kind of that character. He already got sage power before even met the sage.