I agree that the Rams need to figure out what they have with OBO and Lewis. Garrett and Lawler (or a FA cut) could overtake them this year but as of right now it looks like OBO is #3 and Lewis #4. I think we are also seeing the Rams being extra cautious with injuries this preseason.
Rams may have some time on this. I hope so.
I think the Injured Reserve rules have been softened due to COVID ... similar to last year.
A player can be placed on IR and, later-on brought back-off IR.
There used to be a limit ... I think it was two players; and the player had to be on IR for half the season (8 games).
Now, there is no limit to the number of players brought-back-off IR; and the player only has to be on IR for three weeks.
So let's say Obo and Lewis are less than 100% next week, the Rams could IR both of them; and see what they have with Lawler and Garrett as the back-ups to Floyd and Hollins. If they don't perform well, and Lewis or Obo get healthy, then the Rams can activate one or both off Injured Reserve before Game 4.
Of course, there would have to be corresponding moves but by then such decisions could be easier due to performance and/or injuries.