If you ask me, the same as for any other player on any other position; zero.
Remember Ja’Marr Chase last year. A series of really ugly drops sent his stock plummeting. Owners were panic-selling him. Those who kept him, or bought him cheap, are still smiling.
Rule of thumb: If any player makes it through the preseason, even a bad preseason, on the top of their team’s depth chart, they are the one you want, because they will get the opportunities.
On the other hand, even an awesome preseason which the coaches ignore and leave the player buried on the depth chart, indicates the coaches weren’t impressed. BUT it could be an indicator for future returns. Keep that player on your watch list.