The BW survey is largely a customer satisfaction poll. BW surveys the latest graduating class from each of the top schools, along with the companies that essentially make the MBA market and recruit the vast majority of graduates. A third component, purporting to measure faculty research, accounts for 10 percent of the methodology.
SMU Cox was #12 in 2010. Rice was #29 that year and A&M was #30.
UH is too low. Better GMATs than Tech. Baylor/TCU are quite small.
http://poetsandquants.com/2014/03/11/average-gmat-scores-at-top-50-u-s-business-schools/Over the last five years, 13 out of 25 schools in the second half of the Top 50 have shown a decline in average GMAT scores while nine are up. The majority of schools in the top 25 have had increases. Rice and UT had had eight and nine point GMAT increases between 2009 and 2013. I believe Cox's have been trending up as well, at least during that time period. However, the bigger class size a few years ago may have hurt the statistics.