In user's unread listing show the count of other replies to the comment
This is a very minor enhancement idea.
Problem: When user A replies to a comment via their unread list, they may not be aware of other user's responses which may duplicate user A's reply.
Proposed Solution: On the unread listing, show a count of any other replies to this comment next to "Link" - if any other replies exist.
Mockup: I added "(1 other reply)" to link text on the first item in my unread.