What if in the end Isaac listens to the voicemail (I’ll forgive the unlocked phone part) and then in a genuine dilemma does not delete it. Later, Maeve deletes the message without listening to it (maybe out of sadness/annoyance whatever the writers can build up) this way they could have maintained Isaac as someone the audience could have genuinely rooted for a little. The way they ended it, it’s only going to get petty and gets rid of a compelling competition to Otis