Sticking point is that the so called rebels have already used gas.
Three or four times already.
Chlorine was the gas of choice for two of those.
The media trumpeted each gassing, then dumped it down the memory hole the second credible data began showing the so called rebels doing the deed.
If the Rus did it, it would have looked like Assad personally urinated chem weapons from the side door of a helicopter while raining flaming puppies down on the stricken.
True, but in the prev. cases the credible information did come out. Now, I could be wrong, but I don’t think even Obama would move against Assad on information that pointed to the rebels. Enough time has passed for indications one way or another to be evident, if indeed we do have (or have put) people on the ground in the area.
On the other hand, I’m also open to the idea we colluded with the rebels to implicate Assad, so in that case we have Obama placing the cheese in the trap he built for himself, while Putin observes, smiling.