Back to the OPs question.
I think my post above summarizes well the options. And really…with the net price calculator results, what else does this family want? They aren’t going to get a firm financial aid offer until their kid is accepted. And that’s the way it is for everyone (unless a college does pre-reads which Would be onerous if done for each applicant to BU).
No student is required to apply ED. That also is a family choice.