Robert Ford stole William (the man in blacks) maze victory.
The true maze victory is death by an enlightened host. Dolores would have killed the William. She knew what she had to do. William also wanted to die.
Instead Ford scripted that Teddy would save the day so they could have the moment by the ocean with the audience.
The final maze victory happened when Dolores used her own will power to kill Robert Ford in front of a huge audience. Hosts can think for themselves, and now the world will know.