Basically a dollars thing too. Can't use cap space at this juncture on anything that isn't an impact type player, which at this point probably requires a trade.
We don't need another corner, but someone like lattimore is available if you do. Trevon Diggs for another team if you're looking for a cheap player to see if they can regain value.
Its a tough free agent market out there AND there's another new batch of rookies people want to look at. You slowly get nudged out of the league as a guy like Tre. Based on the individual though, i'd absolutely consider bringing him back. Physical limitations be damned, and even with the poor playoff game - he can still ball. Ideally he's not playing in the damn playoffs, just popping in midseason if someone's potentially hurt (or a rookie is struggling).
Bosa looked like he wasn't fast enough anymore. When healthy he was getting after the QB some, but he's not healthy so you have to evaluate what you're actually going to get. An overly aggressive edge who isn't a strong run defender and can lose QB contain upfield. There's also... Reddick, Floyd, Danna, Gross-matos, Miller, Fowler available still in the same budget.
Milano.. . there are 32 teams, most teams carry 2 so 64 weak-side linebacker spots. And he's spent more time in the training room than on the field. It's hard to get a job when a bunch of rookies come in year after year.