Not gonna get into an argument for what Underhill reported because he's not the end all / be all when it comes to Saints reporting. I can report what I know of who was responsible of the Davenport selection much like me reporting that Derek Carr still wants to be traded.
Conflicting reports both claiming to be based on sources is an example of why having sources does not validate the accuracy of what someone is saying. Sources can give inaccurate information, even if they don't intend to.
Knowledge only comes from firsthand experience. When someone tells us that someone else did or said something, that is not actually knowledge. One can believe what they are being told is true, but they cannot know what they are being told is true without seeing or hearing it firsthand.