Yeah it makes no sense to add it next to the quote, it is already visible, when the user posts the quote. Maybe kvv-dvk can shed some light on why they feel it is necessary.
Yeah, we sometimes have quotes from pages back. Whole point of the quote is so you don't have to find the original post. Would be nice to know when that quoted post was made without having to click through. The time/date adds context.
Sure if you're just quoting the post above, then there is no need.