Though i currently am riding a gnu board with gnu bindings, i think sticking specifically to a specific company for the sake of matching is a mistake. I think he should be focusing on finding gear to match his ability, riding style, terrain he enjoys, and features of the products hes interested in. Sometimes this sends you in directions away from sticking to a specific brand.
For example, when i got my gnu park pickle it was because i mostly enjoy the park but will ride all over just hanging with my buddies. Because i have some lingering injuries i bought some Flow NXT bindings, to make bending over less work, which were great, BUT, since the few times a year i get to ride, i tend to head out to mountains that get quite a bit of powder, getting back into the bindings in the deep stuff after a "sesh" became a bit of a hassle i switched to the GNU fastec rear entry bindings. Similar features to the flow, but with an easier to use ratchet to get in and out in the traditional method.
Just my opinion. Your mileage may vary.