Board Thread:The Flash discussions/@comment-5441128-20170716213343/@comment-27700324-20170718182359

Kaestal wrote: It symbolizes their intent to mess with the timeline, nothing more.

Truthfully though, I think it's more of them realizing their powers came from lightning and deciding to make it their symbol like supervillians and heroes are want to do. The lightning bolt symbolizes Barry's messing with the timeline?