Your response to Irishdds' concern about next year's PG was pretty thorough. I wrote something quickly about the same time and when I saw yours, I just meekly deleted my post.
At this point I feel the best and most possible script would be to succeed with Christyn Williams. Not only is she a great player, but I believe she would happily and competently help Marina out as point guard in 2018-19. In her heart she knows she is a shooter, so would have no problems with Anaya Peoples coming in. But, as you say, there is so much we don't know about our incoming players.