This may come off as sour grapes, but it's really important for Musk to point this out. It's not just that you need to go sideways at mach 24 when you reach space to achieve orbit. It's that you need to carry the fuel up to space to be able to do that. Which means that any returnable vehicle is going to be way larger to carry all that fuel. So from an engineering perspective, the size of Blue Origin is a toy compared to the size of rocket that would return after achieving orbit. Not to mention the amount of additional fuel required to decelerate a much larger mass right before landing.