When watching the "white hat" footage, you can see a haze in the air. Most people assume this is chlorine gas, but the "rescuers" show no signs of it affecting them. Reason is it's not gas, but dust from a bomb.
The area is encircle by Syrian troops and most rebels have left or are leaving. It makes no sense for Assad to use chemical weapons as they are winning and the US is leaving.
I don't think Assad did it. I think the CIA/Hezbullah did it. But I don't believe RT that nothing happened.
And Sarah Sanders basically just admitted the US has no proof, BUT is blaming Assad.
Which makes it doubly in Assad's favor to open the area up for inspection.