Who tells him to grind that TBR to mastery? I spent most of my beginner times just buying different chassis and trying different things. I recommend the same till he finds something he likes. TBR is a breeze to play, enough to earn money even without elite skills. Unless he has IRL money to shell, then go for some hero.
Yeah i did the same in my beginners days until i realized that it was much more efficient to grind a Chassis for at least the Elite Skills before moving to another Chassis.
Those were the days. Now I find that most efficient is to buy at least 3 variants of a chassis at the same time, then grind them together. You get first win bonus for all of them every day.