2QB/Superflex Start/Sit: Stream Siemian?

In a 2QB/Superflex league, would you consider starting Siemian (if he starts) over Carr or Brees? My initial reaction is “heck no,” but Carr may be without Cooper and Crabtree, while Brees has been “Mr. Unnecessary” for the Saints. Siemian had strong showings earlier this season, has some weapons, and the Dolphins are bad.
After losing by less than a point in Week 12, this is a MUST-WIN game for me; a win gets me in the playoffs, and a loss knocks me out. I’m currently the underdog, but my opponent has Cooper and Damien Williams, who may both miss. Am I crazy for considering this?!
I could also start Corey Davis, Marquise Lee, or Kelvin Benjamin here, although not starting a QB in superflex seems even worse than starting Siemian.