Yes, well put.

Brown is an average OG.
And unless he really elevates his game this year, they're going to let him go to FA after this season. Not because he's a bad player, but because they aren't going to pay him what some other team likely will.

Rams have too many really good players to sign in the next couple of years to pay much more than minimum wage to an average player that won't be hard to replace with someone about as good.