Do capsules under the muscle always attach to ribs/chest wall?

I've read multiple times that it can be very difficult to remove the backside of capsules that are under the muscle. Do they *always* densely attach to ribs / chest wall? (Especially after ~ 13 years). Or are they sometimes just between the implant and chest wall, but not "stuck down"? Silly question I'm sure but just wondering as I try to prepare for an explant and how painful the capsulectomy recovery might be. I realize the surgeon won't know what's going on in there until he's in there.