Saudi Arabia, with its near-bottomless pit of money, also could have arranged for the rebels to get Sarin or other chemical weapons along with rockets to deliver them, if that's what its intelligence agency decided.
Now, with the emerging U.S. consensus that Assad's forces were to blame for the Aug. 21 attack and Oren's pronouncement that Israel would rather have al-Qaeda extremists governing in Damascus than the pro-Iranian Assad, the pressure is likely to build on Obama to take ever stronger action against Syria.
The other option that Obama may have is to opt for further collaboration with Putin, seeking progress in negotiations with Iran over its nuclear program (as the new Iranian government signals an eagerness to compromise) and pressing to get the Syrian rebels to join peace talks in Geneva (so that the killing and disorder finally can be stopped).
Assad's regime has agreed to participate in the talks but the fractious rebels have refused, first demanding more sophisticated U.S. weapons to give them the upper hand and insisting that Assad step down as a precondition to negotiations. [See Consortiumnews.com's "Who Blocked Syrian Peace Talks?"]
Realizing they now have the backing of Israel as well as Saudi Arabia, the Syrian rebels are likely to resist any U.S. pressure for a cease-fire or peace talks. It's less clear whether Obama can withstand the political and propaganda pressure that Israel and Saudi Arabia can be expected to direct against him.