One or both of Fowler and Armstrong will be gone. They are just worth more to other teams than they are to us. Here, they are deep rotational ends, but there are some bad defenses that might pay them to be starters.
Also, I would personally be in favor of releasing Biadasz, but I understand the argument for paying him too. Interior OLs are really slow to develop, so a rook would likely be unready in year one and a FA vet would earn as much as Biadasz anyway. Tyler isn't good, but he has gone up the learning curve and that has value.