Thanks, Yumi
Because showthread is one of the main XThreads working area, so, I think we can use almost all of XThreads features in this area for the additional profile page. Each admin can uses various custom thread fields to build and design their additional profile page. And user info in showthread is more detail than user info in threadlist, like formatted username, avatar, user stars, user title and etc (the reason why I didn't use forumdisplay for this).
That is my main idea, Yumi
@ Vapor: I hope you are OK to wait, Vapor