There is no reason for you to feel sorry or embarrassed that you asked what is essentially the same question twice. It is an interesting topic, and I am glad that it came up again. I feel that I can explain the matter better now than I could before.
It is also very understandable that this question should have arisen more than once for you. Slippery grammatical problems are like that. Sometimes we feel we have a good grip on them, but then they can slide right out of our hands.
Any genuine grammatical question is a good grammatical question to ask on the Grammar Exchange, and any grammatical question will be genuine if you still have it, regardless of whether you have asked about it before.
Thank you, as always, for your questions. You are a very valued member of GE.