post-byline - why not in a div with an id or class in viewtopic.php

I was just trying to figure out a way to get a link showing next to post-byline and can't seem to find it in a div anywhere

which makes me wonder why is there post-author as div class and not also  one for post-byline or vice versa...

My aim was to have a function that toggles the userinfo when clicked (saving having to go to user profile or clogging page with info which is mostly not needed - by me )

I'm trying to get the same effect as with my hide show category ext/mod....