I'm assuming this is a hypothetica question based on our current roster and situation.
For a GG type CF'er with baserunning skills? Maybe .650 to .675, but it depends on who else is an option to play CF and OF. Abreu is on the IL, but let's assume all are healthy and hitting about what they are, now.
I would not bench a .600 Rafaela, so Yoshida can DH, instead of Duran/Anthony. This could be what the choice boils down to.
If we still had Devers as our DH and 1B and 2B issues solved, and it came down to 3 OF slots and Duran, Anthony, Abreu and Rafaela to choose from, I'd platoon a .600 Rafaela with Duran or Abreu, but never play him over Anthony, unless he was over .850 (and Anthony would pay over Duran and Abreu). Vs RHPs, I would not start Rafaela over Duran or Abreu, unless he was over .775 or maybe more. I'd use him as a late inning defense for Duran.
Rafaela has very close L-R splits, this year and career. (Career, he actually hits RHPs better.) The way Yoshida is hitting, I may never bench Rafaela, even if he hits .500 the rest of the season. If Yoshida gets back to his .790 norm, then maybe .600-.625? It's notan easy call.