If the Bosma family and the Babcock family don't ever have to go to a parole hearing, it would definitely make it worthwhile to have consecutive sentences for both. They've BOTH been found guilty of M1.
Everything I've read makes it seem like irrelevant. People with two separate 1st degree murder convictions don't appear to get parole. I suppose the big benefit is not having victim family members have to go to parole hearings to say they disagree with it.