Just mentioning it: If the clock has meaning as we think it does, then at any given point when we get a Q message, it can be a message for the present, or one meant for the future (or both ?). We will be pointed to that crumb (in the future) again, once the clock has turned around once more …
So from were I stand at this point, there's little knowing how (or for which time frame) a crumb is meant until things happen, and we can check if it works out with the clock.