Forget Andre's inaccurate system. No one's DNA sends out Z's from their scalps otherwise my brothers and other dudes with my type of hair would have spikes pointing every which way when they sport short hair. Instead we see tiny coils that form C's and O's. 4B hair becomes Z's because of the manipulation needed to keep it from tangling.
My naked 4B hair after braids forms zigzags:
My naked 4B hair washed and allowed to dry out of braids but finger combed:
BTW, the section you see finger-combed is so tiny that I was able to separate all the strands fully into single strands. That's usually not so easy to do when I have a bigger section. Believe it or not, the next pic shows my naked hair that has also been finger-combed and FULLY detangled but as you can see, there are still strands clumping. I usually further separate these when in the process of twisting. Trying to do it now on so much hair would be a waste of time as my loving coils are bound to cuddle again:
My naked 4B hair washed and allowed to dry undisturbed (something I'd never do on a large section because I'd have to cut my hair off. I can't imagine having to separate a whole head of this):
My 4B hair (S Curl applied) combed out with a comb (this is the way I wear my hair when out of twists/braids: combed out):
The way to get coils from 4B hair is to wash and condition it well and just let it be. Moisture returns 4B hair to its normal pattern, but usually those of us with 4B know that if we were to let our hair just chill, we'd have tangles that'd drive us to drink. Imagine pen springs pressed together and then compressed and allowed to freeze in that state, how long would it take to detangle 100's of thousands of such springs???!!!
A product like S Curl moisturizes and gives hair slip so that it is easy to comb and can be worn in its "resting" phase without risk of having knots/clumps, because a comb can glide easily through shrunken hair that would otherwise be impossible to work with. I already demonstrated the difference it made to my mom's hair. Her hair would look so purrty when wet but she would do things to it, from combing to plaiting to pressing to make it manageable. She also used a greasy product to moisturize. So she had what Andre saw and decided 4B had no definition. But when you shampoo and wet her hair, you'd see the coils pop. Only she couldn't allow it to dry in that shrunken state until she discovered S Curl. With that, she had no fear of shrunken hair. The moisture it gave and slip made it easy to comb her hair so that she didn't have to stretch it to keep it from tangling and to make it easy to comb. I believe you already saw the pics of the difference S Curl made. In case you missed the pics, here is my mom's hair:
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before (hard, dry, and "moisturized" with grease, previously pressed, plaited, you name it...I guess it looks like Andre's idea of 4B hair?)
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after (washed, conditioned and moisturized with S Curl, and simply combed out)
ETA: Now, if by "definition" you mean clumping, then you do that by doing a WNG and lawd help you when you have to deal with it later. That to me is just a recipe for knots, tangles and hair breakage. But I must also warn you that the defined clumps on 4B are usually so small that en massed it'll just look like a bush, which to me makes the attempt simply nothing but a headache: why go through all that for a look that won't even show and then have the feat of dealing with endless detangling? Seems rather silly if you ask me.
To me definition means making the coils pop. Hair out of braids has no defined pattern. Imagine if you had to stretch and plait metal springs, I doubt they'd have a uniform pattern later on. But unlike metal springs, once we wash our hair hair, moisturize, and let it be, 4B-ers hair gets a uniform pattern of beautiful tiny coils.
) Hawaiian Silky 14n1 or your own mixture.
More accurately, I got sick of trying to make them define themselves - too much work for not nearly enough reward. 
