sometime we missed something and others filled in the gap on our topic. This always happened and thats normal cause not everyone has 99% knowledge on the subject. There's always 1% that we dont know.
Usually this kind of thread is called a discussion thread and all people involved will complement each other so that the discussion goes one direction and with the same goal. Because none of us is perfect, it is very possible that we still need others to correct our shortcomings.
A well moderated discussion thread usually gets a lot of new lessons and opens broader insights to the OP as well as other users and the people involved are usually quality posters so we can all gain more knowledge.