i think he just wanted to show naruto that he will help him .it is a way to show respect (which is much because as we have seen tailed beast don't like humans)so what do you guys think son goku gave naruto when they fist bumped?
ThisHow about we wait to find out? There's been like 15-20 threads about this topic and nobody is going to know until Kishi decides to tell us. Similar to when Itachi gave Naruto the crow with Shisui's eye.