we don't know which raids are required for rootfs, but using deduction, once rootfs did appear we know which raids were not required.
So we could for each incomplete non-rootfs raid do:
mdadm --remove <incomplete-md-device> <arbitrary-member-device-of-incomplete-array>
mdadm --incremental --run <arbitrary-member-device-of-incomplete-array>
we don't know which raids are required for rootfs, but using deduction, once rootfs did appear we know which raids were not required.
So we could for each incomplete non-rootfs raid do: md-device> <arbitrary- member- device- of-incomplete- array> member- device- of-incomplete- array>
mdadm --remove <incomplete-
mdadm --incremental --run <arbitrary-