He has absolutely nothing to gain from using chemical agents when he is already winning through conventional means. Even more so considering he probably doesn't plan individual strikes
Much more likely this is a false flag pushed by Israel/Saudi Arabia because Assad's regime is an ally of Iran - their biggest rival in the region.
"Lantos was a strong supporter of the 1991 Persian Gulf War. During the run-up to the war, the Congressional Human Rights Caucus, of which Lantos was co-chairman, hosted a young Kuwaiti woman identified only as "Nurse Nayirah", who told of horrific abuses by Iraqi soldiers, including the killing of Kuwaiti babies by taking them out of their incubators and leaving them to die on the cold floor of the hospital. These alleged atrocities figured prominently in the rhetoric at the time about Iraqi abuses in Kuwait. The girl's account was later challenged by independent human rights monitors.[30]"
"Nurse Nayirah" later turned out to be the daughter of the Kuwaiti ambassador to the United States."
So basically what just happened with the gas attack and all.