Brockers was drafted No. 14 overall in 2012 -- and would have gone off the board at No. 6 had the Rams not traded down.
The former LSU star will earn over $5 million in 2016 after signing a four-year, $9.52 million contract as a rookie.
It's not surprising the Rams wouldn't pick up the option. With Barron drafted in the Top 10, the formula for calculating the fifth-year option is derived by averaging the 10 highest-paid players at the position -- whereas picks No. 11-32 use the top 25 paid players at the position.
The $8.263 million it would cost the Rams to pick up the option was impractical for a disappointing player who started just two games in nine appearances for St. Louis last year and will be battling for playing time -- and possibly a roster spot -- during training camp.