Nonminimal knot as a component of a ribbon minimal link

A knot is ribbon minimal if it is minimal under ribbon concordance, and a link is ribbon concordance minimal if it is minimal under ribbon concordance. Component-separation conjecture. There exists a knot $K$ that is not ribbon minimal but is contained as a component in a ribbon concordance minimal link. The source presents this as one of two unproved conjectures and gives no resolution.