Re: Puzzling young Mars meteorite ages.
IMO:
Main factors to be considered when ascertaining the trajectory of material cast to space from a heavy impactor would be a planet's rotation and orbital velocity. While debris cast from the ecliptic is very likely, I would think the majority should continue orbiting somewhat toward the plane.
Also, the suggested "out-of-ecliptic vector" trajectory would still have the debris crossing the ecliptic, possibly even near the Earth, at some point.
Dan