User blog comment:TheDoctor230/Barry Hasn't Defeated a Big Bad Yet (Technically)/@comment-26537965-20180110135435/@comment-24152851-20180113001216

It can reach a point where one changes so much that they're no longer the same person. The best arrowverse example would be Hunter Zolomon turning into Black Flash. All traces of Zoom are gone and he's just a walking corpse that serves the Speed Force.