I assume the point of mining in space is to have raw resources that are already outside the gravity well. Not so much for bringing it to earth, but space based construction.
Good point, but the assumptions are that this metal would then be used in potentially life critical systems and would require the full rigor of quality assessments for such materials. Not too sure how that might work in LEO.
How are you planning to do that in future missions? Sending up a a capsule or heat shield for sample return, or is the ultimate goal to return a larger mass and lose some?
Pre-built sample return has been proven to work with another asteroid in a small way I guess, the Hayabusa mission.