Second base in easily covered by some combination of Schneider, Biggio and Espinal assuming all 3 are still on the roster come spring time. I don't really think the organization has anyone suited for full time play at third base for next season, although Biggio looked surprisingly competent in his stint there in 2023. Perhaps Palemgiani, Barger and Orelvis could be future options, but Barger has been spending an increasing amount of time in right field, and Orelvis has been spending a lot of time at second base so it doesn't appear the organization is sold on either of these guys as long term third base options.
I do think Roden has a great shot to be the left fielder of the future as the dude has done nothing but hit at every stop along the way, but I'd hope the organization would bring in a more proven hitter for full time duty in the chance that Roden isn't able to produce in MLB at this point of his career.