I'm not sure what to think of the "Walk away" ending. The casual mention of an unidentifiable polymer blob being caught on camera makes me think that it is a perfunctory "let's pretend to give people a meaningful choice" addition, and that if there's an option to import your old save into DLC it'll say something like "yeah when you walked off Charles killed Sechenov in his sleep, got his shiny new neuropolymer body from the body-dissolving tub, and destroyed the Alpha connector" so that there's a similar outcome to the "Kill Sechenov" ending.