Can you shed some light on my five points about parallel universe?

According to M Theory, any or all of your examples are possible. In any Universe other than our own, the laws of physics may be totally different. In fact, if any of our normal constants was even slightly changed, our Universe would not be as we see it now. As an example, if the strong nuclear force was weaker, atomic nuclei would not have formed in the first place, and we would have a Universe populated only by free quarks and gluons. Some physicists believe it is almost impossible to envisage there NOT being other universes, as in many ways, M Theory is the simplest and most all-explanatory of all, so Occam's razor remains intact. As a pointer towards this, M Theory simplifies string theory by a factor of five, by the single expedient of adding one more dimension to the ten required for each of the five string theories. As soon as you assume eleven dimensions, those five differing but related string theories coalesce, and become the single M Theory. This explains several things we don't yet fully understand, such as the comparative weakness of gravity and answers the old conundrum of the Universe appearing out of nothing. Whilst this is primarily a mathematical concept (and a very beautiful one), there are one or two tiny hints in the cosmic background radiation studies that seem to be pointing in the same direction.