I don't see asterisks. I see a faint line. I see a lot of OVERTHINKING, which does not benefit the reader at all. The letter is not displayed. There is no change of margin. There is a change of context. That is why there is blank line before and after in print and why there should be one in braille. The faint line or whatever that is, is decorative and should be ignored in braille.
--Joanna