imagine if this guys puts on a front brake and uses it as a crutch to not learn a decent skid, then the brake fails (whhich i've had happen twice on my nice road bike and ive never broken a chain) and then he cant stop. i think its the same situation. and i think no matter what the theory is if someone gets a front brake their skid wont be near strong enough to rely on, especially going downhill. but thats just my .02