I like the layout for #11 but I would be interested in seeing how it works with the "&" symbol. I like the concept for #12 also but I think it may be a bit too animated. I'd like to see it with a more serious mime.
I like the concept and the font on #13 but I'd like to see it laid out with the words easier to decipher so it can be read from a distance. Consumers of MMA fashion generally want to convey their message boldly. The people around them should know right away what their t-shirt represents