Well, I've read this thing three times now. And it suffers from the same failure of first principles as Obama's policy. Namely that the removal of Assad is the primary foreign policy objective. And because of Obama's narcissism they haven't moved off from that objective in four years. Looking at it objectively it might have been realistic back in 2011 possibly even 2012 but events have changed so much on the ground with the rise if ISIS that to stubbornly hold to this position is insanity.
As for the Kurds, well they don't factor into the equation for removing Assad so US assistance is minimal. I'm sure Erdogan in Turkey has also played a part in pimp-slapping Obama to make sure that's the case.
I’d remove Erdogan before Assad.