No prob!
I really don't mind, as sometimes, concepts like these are hard to explain. I have included a couple of pics to help.
Notice the first pic.....
See the center pulleys? those are Eagle Racing ones, and the small one behind the one marked "24T" is a one way. The front one way is already mounted, and as you can see, is running a stock plastic pulley. The center one way is redundant - meaning it has no purpose outside of being a drive pulley, so it's removal isn't necessary, because the front one way is already performing the function you want.
The second pic shows the rear Eagle Racing rear pulley, that, in combination with both center pulleys, increases overdrive to 1.60.
O.K., a standard differential works exactly the same as in a full-size car. It drives only one wheel, whether right or left, depending on conditions. The thing to understand about a diff is, the wheel being driven is the one with the least drag on it, or the one with the least amount of traction available to it.
Now....understanding that, the reasons for this are that when cornering, the inside wheel will be turning at a slower rate than the outside wheel. this is why it is called a differential. To accommodate the differences in wheelspeed, between the inside and outside wheels. What a differential will NOT do, is drive both wheels equally, which is what drift depends on, especially CS drift (a little on that, later).
What the center one way, with a standard front diff does, is remove the brakes at the front wheels. That's all. The diff still acts as described above, driving only one wheel - the one with the least amount of traction, and you lose front brakes in the bargain. Not so great.
Now.....The front one way drives BOTH wheels INDEPENDENTLY. Meaning they both still drive at the same time, but being independently driven also accommodates the differences in wheelspeed, between the inside and outside wheels, and what that does, is increase control of the front of the car, by making drive forces equal to both wheels, when throttle is applied or maintained.
A CS'ed car, without a front one way's equal drive in both front wheels will be inconsistent, because the rear wheels, being overdriven, are "pushing" against what "grip" the front wheels have, and as you no doubt have already seen, is the low friction coefficient of drift tires, so there isn't much, to begin with. So....with this constant pushing against the front wheels, you want the best and most amount of control of the front of the car, and the front one way does this, better than any other type of "diff" available (even a spool, which will also drive both front wheels, but doesn't have that independent drive characteristic of each wheel, like a front one way does).
Let me know if that helps, because it's good to understand these concepts, so you know what you need, or don't need.