The Rams can build a great D without trading Gurley.

That would be a much wiser idea. I'm sure you agree right?

Secondly, I question the logic of supporting a theory by asking "when is the last time a team won the SB with a great X (insert position)?"

That same logic is what you used to suggest that Donald wasn't all that valuable - a position which was clearly erroneous and which you have now disavowed.

The reason I dislike that logic is because it can be used to minimize nearly every position with the exception of QB. The only real necessity is a great QB and even that has exceptions.

There are many ways to win.