[JumpCrisscross]

> I'm not convinced that selling some of his SpaceX stock on the secondary market is difficult

Selling SpaceX stock is not difficult per se. The CEO selling his SpaceX stock for the purpose of purchasing shares in a public company, of which he is also the CEO, is. (Source: this is what I do for a living.)

> selling some of his Tesla stocks would cause a rout

Elon Musk selling his Tesla stock to buy new Tesla shares, thereby giving Tesla cash, wouldn't be a problem. (Though it's a roundabout way for Tesla to issue new shares.) Elon Musk selling his SpaceX stock to buy new Tesla shares would be. It shows Tesla was unable to raise capital in the stock markets.