Well, the RAWs could prove me wrong (I'm not going to spoil myself), but I think this will be the end of Leon for good. As an isekai that reincarnates into someone else, an arc like this is needed for closure. Leon screwed up, got killed, resurrected and replaced Uncle, then screws up again. Now Leon can go away again without any lingering sentiment and have Uncle take his permanent position. It's a gutsy move to give this kind of closure so early in a series (or at least I consider 44 chapters early), but now there's no lingering attachment to hold back Uncle.