I think by the time the main team had already settled on their battle morphs, and didn't care to try it. It was similar to the tiger, so one might think if anyone was going to test it, it would be Jake. Except he's the one that got beat by it. Also it might not be rational, but it's not unrealistic to think there was a stigma attached to it after what happened to David. It's tainted. Maybe unfair, but it happens sometimes.
