When the investigators immediately reject eyewitness accounts, I have to wonder if they will pick and choose what other information to include in their report. The employees could give them a thorough accounting, but if it doesn't fit the pretermined outcome, it will be rejected, and we may never even hear about it.
Especially with "good ol'boys" clubs like BP (Beyound Propaganda).
It may sound "Tin Foilish" to outsiders, but insiders know it's standard procedure.
"When the investigators immediately reject eyewitness accounts"
I think you overstate the case if you're still trying the float the theory that the explosion was caused by an invisible -to-radar plane flying into the facility.
I recall seeing one 'eyewitness' quoted (not ever identified to my knowledge and not at the site) early on who claimed to have seen a plane crash. None of the people actually near to the explosion saw any such thing. What's to say? People often think they have seen things that they haven't in situations like this.