Do the size increases stack? It seems like they do as brute doesn't says it's size increase is as if using enlarge person.
PRD wrote:
While in his vigilante identity, a brute becomes one size category larger, gaining no ability score adjustments but otherwise gaining all adjustments for his new size, including additional reach, if appropriate. A brute’s vigilante identity is savage and dangerous. While in his vigilante identity, the brute takes a –2 penalty to AC, as well as to all ability checks and skill checks that rely on Charisma, Dexterity, or Intelligence. Furthermore, the brute cannot use any Charisma-, Dexterity-, or Intelligence-based skill (except Acrobatics, Fly, Intimidate, and Ride) or any ability that requires patience or concentration (such as spellcasting).
