I'm not quite sure I follow you, but I will put my 2¢ in on the thread topic. Other sites I am familiar with similar to this one, "reply" just puts you in a sequential order and if you want to reference an earlier post you just quote it in your reply. This site allows you to actually reply to a specific post, although I think you need to look at the "thread tree" to follow the logic. I find this one a tad confusing at times, although I will admit that I like the general format far above the "other style' that lets things get posted with no grouping or much logic. (I know there are specific format names, but i'm not versed enough to know them)
All in all though I find this to be a reasonably well thought out site and of course the membership is top notch!