@HTK, Lesnar had performed the SSP before coming to the WWE so it was in his move list already and he wouldn't fail when he did it (yes I remember the match tween him and Angle). Angle is much smaller and lighter so a moonsault from him is nothing. And Shelton? What Airfixx said.
Swagger is a big dude and if he had Low Ki's move where he lifts his opponent and runs into the turnbuckle but instead into the mat, then maybe that'd be a better finisher. But I'm cool with his gut wrench.