Board Thread:Theories and Speculation/@comment-26417995-20160120051817/@comment-9782468-20160122125330

Maybe a select few will be able to earn a Tailed Beast's loyalty and sign a summoning contract with a Tailed Beast. So the Tailed Beasts roam free, but lets say Boruto really impresses Kurama at some point, where Kurama agrees to help Boruto if he needs it. So Boruto can summon Kurama to fight by his side.