Last night I also made some comments about the polygraph/confession interview and just want to note the sources:
1) Detectives giving Chris the idea to blame his wife: Discovery Page 601
2) Chris asking to speak with his dad: Discovery Page 602
3) Ronnie Watts not giving Chris the idea to blame Shanann: Discovery Page 602-603
4) Chris first saying that Shanann smothered the girls, then changing it to strangled, and Ronnie trying to get clarification: Discovery Page 603
5) Chris not saying that he saw Bella blue on the monitor. He said he first saw Bella on the monitor, with no sheets on her, and assumed she was hot. Then the monitor cycled to CeCe and he saw Shanann on top of her. He ran to CeCe, pulled Shanann off her, and he saw that CeCe was blue, and he strangled Shanann. He then said after dragging Shanann back to bed, he saw Bella sprawled on the monitor and just knew she was dead (he did not go to her room): Discovery Page 603-604
I only mention point 5, as that explanation obviously got twisted in the affidavit which of course resulted in us spending days and days debating if he could have seen a child blue on the monitor.
I strongly recommend that you all read the interview/polygraph test, as it provides a clear explanation of everything that CW told detectives. It starts at Discovery Page 580 (PDF document page 513). It is very, very long. The initial part is bullet point facts and runs for several pages. If you want to skip all those bullet points, then starting at Discovery Page 596 (PDF document page 529) is a good part. This is where the set up of the polygraph, the actual polygraph and the results starts. After that comes the heavy questions, the conversation with his dad, and his ultimate "confession".
For what it's worth, I think Ronnie Watts was completely naive, but I do believe he genuinely believed Chris's confession and appears to not have coached him other than saying he still loved him, and couldn't blame him for what happened as Shanann killed the girls. I think Chris probably got confidence from his dad's response that the story could fly from that moment on. Ronnie is deluded, but I do feel a little bit sorry for him, he clearly worshipped Chris and his entire world must be shattered.