I told him that obviously the critical expense of getting to orbit was weight. (Of course, I didn't actually tell him anything he didn't know.) Wings, rudder and landing gear are heavy and expensive and are only useful for the last few seconds of flight. All that dead weight did was subtract from what the machine could do in orbit. I said the only thing one really needed to bring back was the crew, and an Apollo capsule would do just fine for that.

He agreed, and said he'd argued similarly.

Musk had an even better idea. Bring the ordinary booster rocket back without wings, rudder, or landing gear by using a bit of extra fuel at the last moment to kiss the landing pad rather than smash it. That empty tin balloon of a booster isn't going to fall that fast or need that much fuel to do it.