Getty Dallas Cowboys offensive lineman Brock Hoffman. The Dallas Cowboys are having to make some tough decisions as the clock ticks toward free agency, and we can assume they know much, much more about what they have on their roster in terms of value than we do. One thing they must have discovered recently was that the market for versatile offensive lineman Brock Hoffman was much more robust than they originally thought. “Sources: Cowboys are not planning to tender C/G Brock Hoffman as an RFA,