Partial Capsule Removal, what happens to there rest of the capsule left behind?

The capsule does not get absorbed by the body. In fact, Nancy Hardt's research in Plastic and Reconstructive actually disproves this theory.
The capsule (scar tissue) is your body's response to your implants and begins to develop very early on after augmentation. The capsule may contain silicone gel, silicone shell fragments, bacteria, calcification, and inflammatory cells which have been mobilized by your immune system to react to different components of the implant.
In addition, if you have pain around the implants, it is usually due to the pulling effect of the scar tissue on surrounding muscle and tissue. If you have health problems that could be from the presence of the implants, removal of the capsule is critical in improving your health. I hope this helps.

Calcific capsules or capsules that are distorting anatomy should probably be removed during the implant removal procedure.  Find a plastic surgeon with ELITE credentials who performs hundreds of breast augmentations and breast augmentation revisions each year.  Then look at the plastic surgeon's website before and after photo galleries to get a sense of who can deliver the results.  Kenneth Hughes, MD, Board Certified Plastic Surgeon Los Angeles, CA

I try to remove the entire capsule when indicated. In some patients, the tissue is so thin that it might compromise the viability of the remaining tissue and therefore can not be done.