them mofo saw that Naruto was in a genjutsu.Why would he even let naruto know that he's in genjutsu?he simply breaks him out of it in an instant by sending chakra to his body like kakashi/chiyo/sakura(don't remmeber which one) did to naruto.......
Chakra mode naruto is two chakra(s) mixed together as one. I'm not seeing Kurama breaking genjutsu right away unless he shut down chakra mode for him and turn it back on.