His integration has to be meaningfully difficult. In that world people die because of Kaijus and everyone probably has familly or relatives killed by Kaijus.
That said, Hibino is a huge asset in Kajus extermination once his willingness to help and his dreams of being part of that team are recognized. But I hope they are clever with the process of Hibino working with everyone else.
He's probably also the only one able to deal with number 9.