Causal support and the exterior placement of the source

The completed scattering displacement is a statement about outgoing identification. It is not used to modify an observable in the physical past; earlier observations use the truncated propagator.

The outgoing packet has a noncompact temporal profile. Its compact approximants in Section sec:compactpacket have their own support and growing-shell ledger. A packet label is not a point in spacetime.

placement. The source is exterior. This construction demonstrates information transfer through exterior scalar radiation. It does not demonstrate escape from a black-hole interior. Moving the source behind the horizon would change the geometry, support, propagation, and observable problem and would require a new model.

The single qubit is spatially extended over a shell. The theorem establishes the printed field-observation support statements, not a generally covariant microscopic theory of that extended source.