There's a difference between "quit pulling" and "quit expanding." Let's say a person is drawing a 45# bow. Toward the end of his draw, he will be pulling about 45# with his string hand, and pushing about 45# with his bow hand. If he stops drawing with his string hand, he will still be pulling 45# with his string hand and pushing 45# with his bow hand. The only way he can quit pulling is to either shoot the arrow or collapse.
On the other hand, when one comes to full draw, one can choose to either keep expanding or stop expanding and hold at full draw without violating the laws of physics.
Aside from that theoretical drivel, which some might consider mincing words on my part, I think the practical implications of what you're doing are important. Most good shooters who use the dynamic release will keep expanding until conclusion. The expansion is not limited to the string side, but involves the back and therefore the bow side as well. Most good shooters who use the static release lock off the back, which locks off both the string side and the bow side, as they begin their hold. A mistake I made for a long time after I decided to start using a static release was to continue to incorporate elements of the dynamic release, to the detriment of my shooting. You may be doing the same thing if you are trying to continue dynamically expanding your bow side while locking off your string side. OTOH, it is necessary to "continue pushing" with your bow hand until you release the shot with either method.