"Since that is where the action took place, that is probably where those words were said. The passengers would not have heard that. When a police officer says stop, stop."
The fact that the first official version was that he was "running up and down the aisle screaming he had a bomb", which didn' fly so now the new version is that he said it in the jetway. That's not consistent with the facts that have come out. They guy freaked out and just wanted to get off the plane. The air marshals knew in flight who he was and that he was having a ahrd time, and the couple was assured everything would be ok. (aThat's apparently not how it ended up)
Air marshals are among the coolest minds. Most have vast experience in the military or police or both and have been in many situations. They are exactly who you would want around in these kinds of circumstances. Not knowing these particular persons, it would be better to file away what has been said and wait for the case examiners to pronounce judgement than to automatically count the testimony of the witnesses as anything but irrelevant and confused.