Whole thing hinges on trusting the Islamist Erdogan not to slaughter Kurds and not to exceed this so-called "security zone" (see map below) or flood DAESH asswipes everywhere.
https://www.debka.com/__trashed-8/Frankly, I don't trust Erdogan with anything...and there are some reports (could be endless war/statist/globalist neerdowells manufacturing it) of "atrocities" and while the article above says Kurds may be inflating aerial damage done by the Turks there is no confirmation here of "atrocities" and the Kurds would not hold back any evidence of the latter.
Best case - No atrocities, no incursion beyond this zone, no flood of DAESH scum. (Those red dots....why are they not our targets as we leave?)
Now...if we can just decouple from the batshyt cultists of Saud...