A very interesting take on Finarfin and his relationship with Finrod!
It is a fascinating idea that Finarfin's foresight might be so strong that it needs schooling by Namo.
I find myself wondering whether there is some connection with Finarfin, later, going to Middle-earth and what it might be.
I'm a bit puzzled about this particular vision--but then I guess so is Finrod. Is he, maybe, foreseeing (or forehearing) the battle of Tumhalad and Orodreth's death? Or is he saying he foresaw something like that in an earlier vision?