User blog comment:TimmyQuivy/Introducing the UserRenameTool/@comment-5558012-20180209181204/@comment-5558012-20180209191513

Interesting. Other than going against the one rename policy, I don't think technically doing so would cause issues if the previous redirects were overrode like when articles are moved back to a previous name that's a redirect. I've never renamed my account or have a desire to go back to a past name; the thought just perked my interest.