User blog comment:Kaestal/My theory of Savitar being the Arrowverse version of Cobalt Blue (And therefore Eddie Thawne)/@comment-24329997-20170415033804

In Danny Phantom, future Danny was more than willing to kill his family  and friends to ensure the existence of his own future. Maybe if Savitar is future Barry, he only kills Iris to ensure the existence of his own future and may be that's why he apologises to Iris for her death but do says that it is either her or him. Afterall Savitar has lost his sanity thousand times and he is basically insane.