Board Thread:The Flash discussions/@comment-27700324-20180131204138/@comment-27700324-20180202024244

Ralph probably does serve the purpose of defending the city when Barry is in jail. Who better to do that than someone who can't be harmed? So DeVoe pretty much made sure nobody can kill the current defender of Central City. He doesn't want to destroy the city. He just wants to test their intellect and teach them more.