current geophysic research points to inversion the best examples use binary modelling, I believe it is possible to adapt this theory to singular formation.
when a singularity is formed it is formed from a mass that has an immense gravity field that must contract to a geometric point in space that is less than the distance from its point of origin to its greatest point of mass in space. Now initially the amount of matter in the object does not change, what does change is the amount of space within the mass, space is displaced by matter, take a sponge and squeeze it to the limit of your strength, place it in a large container of water and allow it to absorb water until it has absorbed as much as it will absorb, if you remove it and squeeze it again with the same force as you used before it will release the water and remain compressed. when a mass is compressed by a collapsing gravity field it releases three things two of them are energy and space and eventually you enter a phase where you have a pure mass surrounded by a unified energy field.
imagination is the greatest initial tool we have so use your mind to see how under the force of gravity matter is reduce to the point where it no longer has space as part of its substance and it exists as pure matter within the dimension of space as it must, but outside of standard physical law.