You're way off base on all counts.
How so?
Cliett/Hollis: After the arrests.
George: After the arrests.
Bearden: After the arrests.
Jennifer Sanders: After the arrests.
Stacy Sanders: After the arrests.
McKay: After the arrests.
Joe Hutchison: After the arrests.
Michelle Echols: After the arrests.
The only one that I can tell they interviewed prior to the arrests is Damien's mom, Pam. I don't care what their answers were, the fact that they never even tracked these people down and interviewed them prior to the arrests is enough to case a shroud of doubt over the entire investigation. On the flip side, do you care to guess how many times they spoke to little Aaron Hutcheson whose story changed and got grander every time the poor kid spoke?