Joey Porter’s strength is getting to the quarterback. That’s what he was best at during his Pro Bowl years with the Steelers, and that’s primarily why the Dolphins signed him to a lucrative free-agent deal last offseason. Coming off a disappointing 2007 season in which he registered only 5½ sacks, Porter’s ability to capitalize on his pass-rushing proclivity will hinge largely on how often Miami goes with a 3-4 defensive alignment as opposed to a 4-3. “In the three-man line, the ‘Sam’ linebacker has got to be able to play the run, but he can be a pass rusher, as well,” coach Tony Sparano said. Translation: Porter will have far more opportunities to rush the passer out of 3-4 sets, which is the scheme the Dolphins hope to employ a majority of the time.