I don't wanna talk about the BS of getting better Brutes if you pupil under a particular master for in my opinion, everything is basically random. I've been a My Brute (web version) player for quite some time, pupiled under different and same masters, but the results were really random.
All I can say is that the pupils who joined my iMac (BEAR) dojo are quite happy. Here's a screenie of my dojo:

As you can see, I unlocked everything [no more gift icon] (too bad the number of pupils don't show) and
CLICK HERE for my Brute gallery to see that I unlocked the 9th Brute, and the pets/stats of some of my Brutes.
By joining my iMac Dojo, you will unlock the usual standard 2x exp for 3 days, Master arena, and my dojo's instant Bear Skin (tough skin). The SECRET CODE is:
FAFEFHFE
BTW: If you're not happy with my Dojo, you can just change masters, or if you wanna try my dojo, you may transfer to mine 