Some valid criticism mixed with assumptions. First we don't know if Russian troops are still in Tal Rifad.
I know I don't. Second we don't know if the Turkish HQ told them to leave Tal Rifad. Tal Rifad doesn't have contact with Turkish border, we're not within artillery range from there. So it's not a direct threat to Turkish towns. I don't know the reasoning but I can speculate that much. Manbij is clearly seen as the bigger problem.
No, you've said you would stop arming PYD, and now there's talk about a 550 million dollar budget for arming the YPG. You DID NOT hold your end of the bargain.
500-1000 we can take it. If we let them achieve their goals in Syria eventually they will cross the border and threaten us. It would be even better if we could destroy them before Americans are done arming them. They say Tillerson is coming to Turkey, we'll know what happens after that.