@Talh technically speaking kururu is just a sword priestess not strongest sword priestess to actually ever exist as that Person should be dead in the past so to become strongest sword priestess kururu's powers won't really be enough so right now the power her uncle got will be strongest among sword priestess and how he is sword priestess well, he is one with the sword lol aslo the uncle did became kururu then there is a slight chance of him running away and if only uncle switches soul then where will kururu's soul go also our mc can bring her back from anywhere using the power of plot so yeah.