Fair enough but some people have insinuated more.
His first account was in a time of shock.
You keep making this claim. It wasn't.
This man has no motive to change story. He genuinely feels 9/11 is a cover up and refused millions because he refused to be silenced
Are you aware of "memory bias" and "false memory"?
If a person determines that a certain event happened a certain way, they will often subconsciously alter their memory of that event to better reflect their interpretation.
In other words, because he believes it was an inside job, it is highly likely he has subconsciously altered his memory of that event to include explosions when there were none.
This does not mean he is "evil" or "dishonest". He wouldn't even know that this has happened, and he would genuinely believe his current memory was ALWAYS his memory of the event.
This is a very well documented and established phenomenon.
Personally, I don't take his account of an explosion to bear much weight. What, to me, bears FAR MORE weight is his account of what he saw when he went to investigate that sound.
His account of the blown elevator, skin hanging off arms, white smoke, etc is completely in keeping with an explosion caused by ignited jet fuel which had poured down elevator shafts. It is NOT in keeping with a bomb (for example, a bomb capable of blowing elevator doors outwards, away from the elevator car, would obliterate all remains of anyone inside the elevator car, not leave survivors bearing flash burns).
-Gumboot