I am not particularly impressed with size alone. I am more of a fan of good football players intelligently played to their strengths. Charles Haley was never a big DE but geeze did he play like one. Another old timey thing the Cowboys have done is go with speed or quickness because it is something that cannot be taught, you have it or don't.
I do like what Bill and JJ have done this year. But I would not describe it as purely geting bigger. Just better.