In a way, those whom fate had chosen were the most expendable of the crew.
On the face of things, he was the most expendable.
Right now I am the most expendable person you have.
Of the four men on board he, not Murdock, was certainly the most expendable.
"You said yourself it was a job for the most expendable."
"Keyboards" is always the most expendable position in a band.
"They probably want to send the most expendable crew of the four of us."
The problem is, he isn't sure which is the most expendable.
You broke your fall with the part that was most expendable.
"The way I'm seeing it, I might be the most expendable one up here."