(A mysterious “voice” tied to the great whale and explicitly echoing the late Oden.)
The payoff
(Pending — the ability and its inheritance are forward of this window.)
Earliest known caller
(Fan tie of Momonosuke’s “voice” to the Voice of All Things — caller TBD.)
Why this matters
Oda links a perceptive “voice” to a bloodline (Oden → Momonosuke) and to the colossal living animal bearing Zou — a quiet pre-load of the Voice of All Things mechanic around the Kozuki line, paralleling the Roger-era precedent.