I think the scientific goal was 60 grams which is more than just one piece at the size of the gathering head so they'd have to decide which tests they would act

I think the scientific goal was 60 grams which is more than just one piece at the size of the gathering head so they'd have to decide which tests they would actually do instead of being able to do all of the planned tests. So yeah just getting one larger piece would be a loss for the mission.