somedumbnoob

You can't judge "best placement" in these fields unless you take the differing student bodies into account. For example, Georgetown's student body is generally known to be far more preprofessional than Uchicago's. Therefore, Gtown doing better than Chicago in the number of students it sends to top law/med/mba schools is not unsurprising. But that doesn't necessarily mean that a Georgetown degree is better than a Uchicago degree as the term "best placement" implies because fewer Chicago kids aimed for those professional schools in the first place.

Similarly, Reed college is ranked at the top for sending kids to phd programs but doesn't surface in your data... does that mean that they can't send kids to law/business/med school or does it mean that the students there simply aren't interested in going to professional schools?

It would be better to compare how popular preprofessional programs are at these colleges before comparing them. But I wouldn't know the means of obtaining that data.