It may be so that the investigators are trying to understand. The only version that is available might be coming from the perpetrator, and he may be telling something that benefits him, you know? Melissa is not alive to tell the truth. So the police may be trying to reconstruct the truth. It seems that the time she left, 7:22, and the fact that it takes about 20 minutes to drive to the hospital is too tight for anything else. The only other version that in theory might be plausible in our times involves BS being the local neighborhood dealer. However, it doesn’t merge with Melissa’s personality (the first time she was not at work on time, the nurses immediately called the police). It seems that she was too organized, and usually such a scenario would include lack of money and disorganization. Granted, I know some super organized people with this problem, but money would be an issue, and she just had her dream wedding.