IMO no. Snead showed us why you take the best player available when he chose Donald and he played so well. Even if it is an area of strength, if you think someone is a difference maker you have to think about him. I consider WR the same way. The Rams receivers may end up being a good corps, but adding Cooper or White could make them even better and guard against someone not producing due to injury or lack of NFL talent.
Plus, Brockers is a free agent after the season. DTs usually get paid well. I don't know what Fisher and Snead think of Brockers but Snead has said that you have to set a value on a player, especially in Free Agency and try to stick with it. The Rams have a lot of players coming up for free agency next year. They may not be able to retain them all. I am sure they already have an idea who they like the best. If they see Brockers as a must keep, then maybe Shelton isn't high on their list.....wish I had privy to their BPA list for the draft. I don't think Shelton will be on that list of 10 or 12 top picks. But I could be wrong.