Mo, the dirt collected with post vac if a non encap detergent were used would be considerably less as far as the amount collected. This would be the result because of the sticky, dirt attracting residue left behind with a regular detergent. As far as the appearance of the soil collected, it would have maybe only a slight difference because in order for the vacuum to pick up soil, the soil would have to be dry enough to be collected. The main difference would be that more soil would be trapped in the carpet by the sticky residue and less soil would be collected.
I am familiar with the microscope photo that you posted. I think that it is an excellent picture of what the encap is doing. Now imagine the amount of soil in the microscopic image multiplied by a million or more, and you would have the result pictured below.
I copied that picture from the VacAway site which also included the picture that you shared.
http://VacAway.com/images_dumpster/index.htmNo, I do not think that the Tuway "thin one" pads pick up more soil than a cotton or cotton blend. The Tuway is less absorbent, but they do absorb. I use them quite often on CGD, but in some cases with an extreme soil load I will use Super Zorb pads.