That might fit a theory that impulsive Damon wanting the life insurance proceeds (if there were any) rashly gets with his out of town friend (outside the swinger and PD circle) takes the body from the warm, dry storage place it has mummified in and dumps it in a place where it would be easily found.
Why did Damon need an outside the group friend? Maybe because the others didn't trust him anymore -- that he somehow was involved with Danielle's demise -- witness the stoned stone faces the later part of the critical night.
Excellant question. Was the "boy friend" already in SD when Danielle disappeared? I have always wished someone had questioned that guy.
Maybe he really wasn't an old boy friend but a local internet porno ring member, and maybe Damon didn't really take him to the airport. Cover (up) story?
TOO MANY PEOPLE NOT TALKING.