Given you have Watson I would be OK dropping Dak. Ideally, you’re not playing either this week, and Weeks 14-16 my QB model projects Watson to be the QB5 and Dak to be the QB8. For this week, I would start either Foles (projected QB2) or Darnold (projected QB10) over Watson (projected QB27). Foles is the riskier play because of the small sample size, but I think is still a viable streamer.
I would actually pick up Darnold and plan to stream him for the next two weeks. In Week 14 he projects to be the QB7 vs. Miami, where Watson is projected to be the QB17 vs. Denver. Obviously you would pivot back to Watson Weeks 15 & 16 if you’re still in it - he has the seventh-best schedule for fantasy QBs those two weeks and is projected to be the QB2.
My Week 13 QB model is below if you’re interested. Hope that helps. Good luck!
Please check out my Week 13 streaming post where I provide weekly and rest-of-season rankings, scoring projections and waiver recommendations for QBs, TEs and DSTs. Comments and feedback are welcome. Thanks!