Nick was already different to other Grimms before him by the way he treated most wesen. He was best friends with a blutbad and sleeping with and probably married to a hexenbiest, and has a another hexenbiest for a step-daughter and over the course of the show, him recording wesen kills in the books didn't lessen his bond with Monroe who helped him A LOT and it sure didn't lessen his bond with Diana just because the writers wanted Kelly, another Grimm to write in the booksto carry on his Grimm legacy as well as his father's by working with wesen just as Nick before him.
It isn't about withholding something from Diana for any reason and as I wrote before, Diana clearly didn't take it personally that Kelly has/can write in those books as a bona-fide Grimm while she must be content to tag along for wesen hunts. Nick never prevented Monroe or any of his friends from physically writing in the books. From time to time, they helped with making several entries but Nick always wrote in the journals and I don't doubt Kelly is the same with Diana. I think it's understood that the books are written by Grimms for the purpose of helping future Grimms therefore Nick's wesen friends and stepdaughter respect that "family tradition". It's like the lineage book only recording Grimms and excluding sightless siblings as it did with Nick's uncle. I think this was purposeful on the writers' part to show only Grimms writing in the books, even with Nick who was a progressive Grimm.
Maybe if writers made a habit if showing the black eyes in the presence of a wesen, it wouldn't be necessary to end the show with Kelly writing a journal entry but that wouldn't have worked. It would have been too random and pointless what the writers did was have Kelly draw a connected between the end scene of Nick in Monroe's living room and the 20 year gap. The journal entry is nothing more than a narrative tool that technically stuck by the established rules of only Grimms writing in books.
Diana isn't offended by Kelly writing in the books about Zerstörer or any other wesen for that matter. The books don't define her relationship with her brother nor with Nick. She is content as seen in her teasing Kelly and smiling as she closes the book in which Kelly had been writing. Oddly enough she is the last person we see on the show before the big "G" on the cover of a closed book, Nick was the first person we saw on the show before he got his sight and saw Adalind, Diana's hexenbiest mother. She may not be a Grimm physically writing the entries herself to leave to her future descendants like Nick and Kelly but she isn't lesser for it, she's a part of that Grimm legacy because it's her extended family's legacy and she gets to share in it however long she decides.
It isn't about withholding something from Diana for any reason and as I wrote before, Diana clearly didn't take it personally that Kelly has/can write in those books as a bona-fide Grimm while she must be content to tag along for wesen hunts. Nick never prevented Monroe or any of his friends from physically writing in the books. From time to time, they helped with making several entries but Nick always wrote in the journals and I don't doubt Kelly is the same with Diana. I think it's understood that the books are written by Grimms for the purpose of helping future Grimms therefore Nick's wesen friends and stepdaughter respect that "family tradition". It's like the lineage book only recording Grimms and excluding sightless siblings as it did with Nick's uncle. I think this was purposeful on the writers' part to show only Grimms writing in the books, even with Nick who was a progressive Grimm.
Maybe if writers made a habit if showing the black eyes in the presence of a wesen, it wouldn't be necessary to end the show with Kelly writing a journal entry but that wouldn't have worked. It would have been too random and pointless what the writers did was have Kelly draw a connected between the end scene of Nick in Monroe's living room and the 20 year gap. The journal entry is nothing more than a narrative tool that technically stuck by the established rules of only Grimms writing in books.
Diana isn't offended by Kelly writing in the books about Zerstörer or any other wesen for that matter. The books don't define her relationship with her brother nor with Nick. She is content as seen in her teasing Kelly and smiling as she closes the book in which Kelly had been writing. Oddly enough she is the last person we see on the show before the big "G" on the cover of a closed book, Nick was the first person we saw on the show before he got his sight and saw Adalind, Diana's hexenbiest mother. She may not be a Grimm physically writing the entries herself to leave to her future descendants like Nick and Kelly but she isn't lesser for it, she's a part of that Grimm legacy because it's her extended family's legacy and she gets to share in it however long she decides.