wrap timing belt around timing gear

So just wondering why we dont wrap the timing belts around the timing gears one loop rather than the way its commonly connected. Thought i would ask before i spend a couple days wasting my time experimenting as im sure its been tried before and if it worked better wouldnt we all be doing it that way already?
Does it wear the belts prematurely, cause more drag, take more torque to work or what?

im not sure exactly what you mean, but im pretty sure the answer is the pulleys are not wide enough and it cause wear because the angle of the timing belt is off.