Well what I'm saying is if you throw your arms back and forelegs forward, that would have the result of turning your entire weight backward, you can't jump like that and land straight. So if he's jumping more or less straight up and down, that pose would result in a sloppy landing.
But if he's jumping backward that pose is good, though the hands should still be bent down, always at the ready. It looks to me like you have backwards and forward/up jumps, and should use them accordingly.
Grab animation looks good.