Marques Douglas played DE for SF in their 34 this past season and the guy was a tackling machine (I know because he was on my fantasy team). He's naturally a DT, and he's definitely a good pass rusher for a guy a who is 6'2" 295 lbs. He could fulfill Larry Triplett's role more effectively, I believe. He's 30 years old but hasn't missed a game in his entire career. Food for thought.