Sure. Shane Williams. At your position as a flanker: Neal Back. They excelled with ball in hand by quickness and speed, i.e., taking advantage of momentum being the product of mass time velocity. Certainly in Williams case, being hard to tackle by positioning their body to their advantage. In a no-room-manoeuvre confrontation with a much bigger man who has tackling skills, the smaller player will always have a disadvantage. Everyone recognizes this. So if you are the smaller man, do not plan on the Maori sidestep as a part of your ball-carrying repertoire.
Small guys don't break through, they evade. Pace,sidestep, jink, swerve. Big forwards like nothing better than a small back trying to run through them. BTW brakes are on cars.