What is the purpose of those “small number” of troops? The recognized government of Syria doesn’t want us there.
The purpose of a small number of US troops would be to stand by the Kurds who helped defeat ISIS. The agreement by the US, Turkey and others provides for a buffer zone in northern Syria between the Kurds and Turkey. A US presence should dissuade Turkey from violating the agreement and attacking the Kurds beyond the agreed upon buffer.
Turkey is no longer a good NATO ally and Erdogan has his own agenda and visions of new caliphate.