I develop in more detail the ideas of global consistency principle and delayed initial conditions in a recently published paper,
C. Stoica, Global and local aspects of causality in quantum mechanics.
This is a proceedings paper, for the Conference [link:timemachine.polito.it/home/?q=node/2]The Time Machine Factory [unspeakable, speakable] on Time Travel in Turin[/link].
Here are the slides of the talk.