We have an answer as to who will play free safety in Week 1. The team declared Jimmie Ward inactive, but would not name a starter at that point. Since then, Jaquiski Tartt is warming up with the first team defense, and it appears will get the start.
Tartt competed with Lorenzo Jerome and Adrian Colbert in practice, and really throughout the preseason. Jerome started the first two preseason games while Tartt was recovering from a rib injury. Tartt started the third game and Colbert started the fourth game.
In that third game, when the 49ers moved into their dime package, Tartt moved into more of a linebacker role while Jerome moved into the free safety role. We can likely expect some similarities when the 49ers go with a bigger dime package.