More of a function of the number of members with affiliation to HADES schools than anything else. All you need is one vocal parent/student from Milton to shift that dynamic. After all L’ville cheerleaders were noticeably absent until @mrnephew showed up. Middlesex is another example of a strong school that sadly lacks a presence here. The list could go on.
Both schools are fantastic, but like E/A, I personally feel that a student would be at home at one or the other, but not both.