Earl being a hard hitter could be a gunner and anyone else who wants to make the roster could fill that spot. Not a hard position to fill because it's based on attitude. All gunners do is open the lanes for everyone else to make the tackle. They look good because they are often the first ones to the ball. However they often don't make the tackle. I believe that gunner is the least of the Texans worries this year. Plus Gunner is the most fun position on the field. Everone like to run full force and level as many blockers as possiable.
I've adopted Eric Moulds