Also, it is clear that MVPB do better than NDC in general. They should not be lumped together.
I don't see how that is clear at all. The accounts of M's and B's OCI don't seem any better than D or C at all. Having seen callback/offer data for M, V, and N, I can say that none have a really clear advantage. I think Penn is the only school in the group with a clear advantage, if only because it is a core recruiting school for V25 NYC firms. ITE, those are the only firms that are still hiring tons of SAs.
I also think aggregate big-law placement is a poor metric to use to compare T14 law schools. Firms don't hire mechanically by GPA, and law students by and large don't do a very good job of bidding. At the same time, firms might have more callback slots at their core recruiting schools even if they have similar GPA cut-offs at peer schools.
For example, consider Duke and NU. Historically, Duke fed into the NYC offices of V50 firms, while NU placed into the Chicago offices of V50 firms. This was not a matter of "placement power" but rather self-selection. It was just as easy or easier to get a job in the NYC office of the same firm, but most people came to NU to work in Chicago so that's where they went. Firm hiring practices reflected this self-selection: NYC offices had more interview/callback slots at Duke, Chicago offices had more interview/callback slots at NU.
So what happens ITE? First, a lot of people at NU still bid in Chicago. TLS aside, it's hard to tell people who grew up in the Midwest and want to stay here that they need to go to NYC just to get a job. Second, for people who do target the NYC offices, the relative GPA cut-offs don't change. Firms still consider the two schools to be peers. Third, the the allocation of interviews/callbacks doesn't really change. Firms still expect to hire more people out of Duke. What's the result? Firms end up hiring more people at Duke than NU, but from a similar range of class-ranks.
Now let's consider how this impacts other schools. It severely hurts schools like Berkeley and Michigan. Firms might consider them just as good as their core recruiting schools, and apply similar GPA cut-offs, but because they historically never hired tons of people at a time from those schools they don't allocate many slots to them. This even hurts U of C, which firms might consider a peer to Columbia or NYU but who nonetheless won't hire as much from.
ITE, hiring in the T7-14 band is more influenced by market/firm affinity than anything else. There are a couple of DC firms where I'd rather be one of the few NU grads gunning for DC than one of the many UVA grads. There are a couple of Chicago firms that hire tons more NU people than Michigan people. There are a couple of NYC firms that hire extensively from Penn but don't even do OCI at NU. Once you start breaking up the MVPBDNC band, you have to quantify those variables, and you really can't in any accurate way.