Board Thread:Naruto Discussions/@comment-36006024-20180926134241/@comment-32685487-20181003211612

He didn't need their chakra to actually mentally connect with him. Otherwise that means the other Jinchuriki needed all the chakras too in order to mentally connect like they did in 4th War. Until the manga itself outright says he still has other Bijuu chakra besides Kurama, and the Boruto anime outright says the same thing.. then no. All he has is the same mental link ability that the other TB's and Jinchuriki were using before he even showed up in the mental link to talk to them.