With Jimmie Ward back on the wagon (off the wagon?) with a broken collarbone, the Niners are already back to the Adrian Colbert/Antone Exum Jr. combo of 2018. And while there may still be plenty of potential there with Colbert, he didn’t perform well when healthy last year, and he has a bit of an injury history of his own.
Another option might be DJ Reed who filled in at FS for a couple of games last year, but both he and the coaches seem to be more comfortable with him playing in the slot.