So Fitbit targeted Jawbone as a source of engineering and product development talent. That seems like fair play to me and anything less would seem oddly uncompetitive.

Some of those ex-employees broke the confidence and policies of Jawbone while employed there. That's the issue; Jawbone needs to address that with the individuals.

If they want an injunction preventing Fitbit from using the literal documents in question, or the specific confidential information about product roadmaps in the employees' heads, that seems appropriate, but it's unclear how you'd enforce it.

Fitbit is going to develop features in their hardware and software that compete in the market. Inevitably, some of those same features will have been on Jawbone's roadmap. The fact they get developed isn't proof to me that it was stolen.