I think this rumor about Obi-Wan's kid/grandkid could lead to ...some Obi Wan movie(s).
If there isn't a scene with Max Von Sydow in an Imperial Admiral's uniform on the bridge of a Star Destroyer in this movie, than the entire project is a waste of time.
Max Von Sydow does seem to be a big question mark here. He wasn't present for the table read, or at least for the photo.
Also, no Kenny Baker in the photo. But what is he going to do at a table read?