We know Danielle and Westerfield are inextricably linked, whether he did the deed or not. They have been linked together by hair and fibre evidence by virtue of:
(1) the cookie visit
(2) the "tail feather fest" on the evening/night of Feb 1, when fibre transfer was possible (Locard theory of transfer)
(3) DW soon became he prime suspect in this case, with LE all over Danielle's stuff and DW's stuff.
The question is: do the fibres and hairs show they were linked before (yes), during (?)or after (yes) the "abduction"? We need to find fibres which prove "during" if DW is guilty.
Before the alleged abduction: Yes, there must be linkage, as we know there was the cookie visit within days of the "abduction". There was also possible transfer during the "tail feather fest" at Dad's on the evening/night of the "abduction".
During the alleged abduction: Aye, there's the rub! This is what we really want to know!
After the alleged abduction: They are linked simply by virtue of DW being a suspect. Once that happens, particularly if he is the prime suspect, more and more linkage occurs. At this point, fibres may be shed and/or transferred by LE (and their search dogs) which are "after the fact."
What I am (we all are) searching for are fibre links which definitively point to linkage between Danielle and DW DURING the alleged abduction. So far, I have not found such, but not for lack of trying!
So I'm not so nearly set on any fibre evidence as on DNA and the bugs.