Since I will likely not be awake at 21:00 UTC, let me post now. I think people should still be able to post answers which could change in future.
At a given point in (real life) time, there will be some unexplained plot points. Sometimes to answer questions, those unexplained points need to be "filled up". As these points are explained later in the series, some of these "fill ups" become incorrect.
However, if we are too restrictive on such speculation, we might end up making this site Wikipedia [citation needed], and that would basically make this place boring and useless.