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.

The risk of complete capsule removal in under the muscle implant positions is too high ion some cases and best to leave it if there is no ruptured implants. If you have old silicone gel implants that has ruptured, then should have the entire capsule removed safely. 

The scar or capsule will remain.  I don't perform partial capsulectomy in patients who are having explants.  They either have all of the capsule removed or none.  Usually if they have no capsule removed I can have them improve their volume with fat grafting.

Most plastic surgeons do not remove the entire capsule as it is very difficult.  Both Dr. Ghazi and Dr. Feng are very experienced plastic surgeons in explantation so they realize that partial capsulectomy is not a good idea.  Peer reviewed literature in plastic surgery  confirms that total capsulectomy is needed in order to avoid future complications from seroma, infection and difficulty with cancer detection.  If one is ill from breast implants, then antifungals, immune and endocrine support as well as detoxification and treatment of coinfections including intracellular bacteria, yeast, mold, and viruses is important in order for the patient to regain their health.  For example, in ALCL, the factors that lead to lymphoma are chemical and mold biotoxins, so leaving even a portion of the capsule with a textured implant, would not be a good idea.