I did some calculations using the data for H and Y posted on the USNWR website (http://www.usnews.com/usnews/edu/grad/rankings/law/brief/lawrank_brief.php
). If you only plug in the data that they post on the website (using their weights), H beats Y. This means that Y beats H on the factors that are listed in their methodology (which have total weights of 12%) but the data for which are not on the website. These are:
1) Expenditures Per Student -- The average expenditures per student for the 2003 and 2004 fiscal years. The average instruction, library, and supporting services (.0975) are measured, as are all other items, including financial aid (.015).
2) Library Resources (.0075) -- The total number of volumes and titles in the school's law library at the end of the 2004 fiscal year.
This means that H doesn't have to change their admissions policies at all to beat Y in the rankings -- they just have to change their expenditures per student (library resources count for too little to matter) -- or change the way that this is calculated (it must be a fairly complicated [i.e., arbitrary] formula given that both YLS and HLS are part of larger universities).