I havent had a a-hah moment in a very long while.
But i guess the little knowledge that i have that seems to make a difference is knowing one’s center and where you are rooting.
Mostly when youre walking your roots are your feet connected to the floor. And your center is supported by two roots while standing. When you stand on a leg, your center is aligned from your root ( the foot on the ground) and ideally to the crown of your head. To be strong in this posture (as in where tensing your muscles and moving your arm do not affect your equilibrium for example), youve got to be symmetrically aligned.
Now for most, its a natural understanding.
On the ground, its different. The center is not a static point in your body, it shifts according to how you sit. When you stand, it will be at your hip level. If your ball up. Its not going to be at the hip anymore. When you have a real ball, its center is not on its surface.
And when you have another body adding his weight to yours, the combined center is definitely not at your hips.
Thats for theory.
In pratice, its rather simple. Bjj is simple enough that your root ican be fairly close to your center. Especially if youre in side or your opponent is turtling. In which case your root and your center can be the same. And if you base your hips on him, your body position in space will be heavily influenced by him ( like being on a horse, you might do jack nothing, but if the horse moves, your body will move in space also). So body surf, and know matter what happens, if you know how to body surf, you will stay on top.
Now that was assuming if you passed guard.
Passing guard is relatively easy ( my submission game is worthless, points all the way!). Passing is simple enough if you can keep his center static in relation to yours. He can shift all he wants, but if your basing off him. It means jack nothing.
Anyways example case study from my favorite guy:
YouTube - Terere x Marcelo Garcia
When terere passes marcelos guard. He keeps his center pinned on the floor ( shoulder heavy on floor and lifts his leg). Roots on him completely, surfs to the other side. Job done.