Instead of being worried about the possibility of the dead being able to come back, Lancaster's mind went straight to the possibility of his parents being able to come back to life.
Just like Atlas had someone he cared about that he wanted back, Lancaster also had people. Instead of feeling weird about the desire to bring the dead back, he was able to understand where Atlas was coming from.
"So, is it really possible?" He asked again just to be sure that Atlas wasn't joking with him
"Yes, it's really possible. But not yet. I'll tell you more about it when we have everything that we need..."