>> I imagine is something you would have to design a larger rocket around, rather than add in after the fact. Control authority. That is the measure of margin

>> I imagine is something you would have to design a larger rocket around, rather than add in after the fact. Control authority. That is the measure of margin a system has over a feedback mechanism's (in case of a rocket: ability to accurately apply thrust in correct vector at required frequency) ability to dampen uncontrolled perturbations. I'd bet you that SpaceX has just as thoroughly understood and tested their working margins on their landibg system's control authority as has Blue Origin. For this reason I don't believe Blue Origin has any technical advantage over SpaceX in the manner you imply they do. This might be hubris, but there aren't too many things us humans don't understand about rocket design at this point. The last big one was the waterhammer effect in turbo pumps supplying rocket fuel. Understanding 1st, 2nd, and 3rd harmonic vibrations in mechanical systems is standard practice in rocket and any other airframe design (Boeing airframes, missiles/rockets, etc). It's a solved problem. If Bezos is hanging his hat on this argument, he's reached the limit of his omnipotence.