The obvious thing is that they are loading up in case of injuries this year plus they don’t really know what they have.
But it’s also loading up for next year.
Next year, they have to re-sign Hill, see if Bradford is still viable, add a guy (by one of many different ways including draft, trade, or free agency), AND figure out if they want to keep any of the newest 3: Davis, Keenum, or Gilbert.
I would like the Rams to sign an under 30 veteran backup who used to be a starter. Someone like Sanchez or Ponder, etc… to take over long term if/when Bradford goes down again.