BITD we used to place a short-thick horizontal piton in the interior horizontal crack. The crack formed by the flake was too big to fit the hammer in and get any swing, so the hammer had to be used sideways, and even so you couldn't get much swing.
The big crack is pretty wide. Tod mentioned getting his head in; I've seen a small woman jam both knees and get a hands-off rest right at the part most people think is hardest.
As I remember, you can get in more than one Alien side by side in that horizontal. Given that you can't really see how they are cammed, the more the better.