Not much more beast, I don't think that Kurama really liked Hashi that much. So I doubt that he would give Hashi any of his power willingly. I also don't think he knew any of the techniques that Bee used in order to tame the Hachibi. So I don't think he would be much more powerful. Hashi would likely only get very little amounts of chakra from the kyuubi, Hashi sounded like an absolute **** to tailed beasts. Seriously going around and hitting them with humongous wooden gates from the sky that suppress their power, Like seriously to tailed beasts, Hashi must be a huge asshat.