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Jamaal is a third down back? How do you figure that? It's usually the bigger backs that get in on third down and can get you the tough short yardage stuff.
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Uhh... no. Third down backs also known as "third down specialists" are small squat scat back types. Of course you don't put them in on 3rd and 1 because like you said, you want a big guy. But 3rd and 3, 4, 5, 6 which happen a lot more often than 3rd and 1, I don't want a couple of Fullback size RB's in the backfield. I want someone who is capable of making the big play.
Many people call Warrick Dunn a "third down back" or "third down specialist" becuase he can run the draw, toss, or be a receiver out of the backfield which is what you want on 3rd down and more than a yard. Someone who can give you a lot of looks. You send your big back in there on third and 4, and the defense is going to know you probably aren;t going to hand it off to him, or pass it to him, or run a delayed hand off to him.
So like I said, Jamaal Evans is a third down back as I see it.