Duran actually does "steal 1B." His speed gets him many more IF hits than almost anyone else. His speed also makes him close to an average defender in CF, IMO, but I'm no expert on where his defense is at, this moment.
I have not been big on Duran hype, and I do not think he is a lock to be a plus CF'er in MLB, especially in 2021, but there is certainly a chance he is an overall plus, right now.
If Cordero comes through, we don't need Duran, this year. If he doesn't we can use Chavis in LF, and maybe Renfroe and Chavis's offense can outweigh the ,losses on defense.
We have multiple ways to make the OF a plus, including using Kiki in CF.