you’ve thought about this a lot more than I have. I was mostly thinking about being a witness to their own murder, and how the opposing lawyer would down play the testimony due to the process of necromancy or something. Or how the courts would dismiss or not allow the testimony due to the uncertainty of the necromancy.
I didn’t think about pulling the dead to be subject matter experts, or a bystander witness.
It’s fun to imagine this long dead guy always being resurrected because his the topmost expert in some relevant field, like ballistics.