Oda loves foreshadowing certain strong characters and let them slow brew through arcs and real life years.
He doesn't time to let a new one slow brew for decades like he did with Shanks, Mihawk, Kuma, etc, but Shanks twin, who was foreshadowed as a mystery silhouette all this time, falling in this arc, without Shanks involved, is definitely too soon and uncooked.
Shanks could always be involved at some point but we saw him sail away right before this all started.