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Miller has set up in the backfield as a receiver more than ever, continuing an experiment that began last season. Grisham has been a favorite target of quarterback Ben Roethlisberger in camp, continuing another trend from a year ago, and likely will take departed Antwaan Randle El's spot among the group of wide receivers.
Moving Miller to the backfield gives the offense more versatility and also creates more confusion for a defense.
"It's something new and exciting," said Miller, who enters his sixth season. "I'm always up for trying something different. I got exposed to it last year. I'm up for the challenge.
"It's probably more for passing situations than running situations. I think it helps with protections -- maybe when you get two backs in the backfield, it's harder for the defense to pick up on whether you're blocking [for the run], protecting [for the pass] or releasing."
Miller's teammates believe he is the most complete tight end in the league and, at 6 feet 5, can be more productive as a receiver if need be. He made the Pro Bowl after he had personal highs of 76 receptions and 789 yards in 2009. That fell off to 42 catches for 512 yards last season when the Steelers cut back on the passing game.
The new move is an indication they want to take more advantage of his catching ability.
"It's really just taking a halfback out and getting an extra receiver in," Roethlisberger said. "So I think we evolved a little bit. We did it a little bit of it last year but you're going to see a lot more of it. We have different packages. We have to get him in there, we have to use him.
"He's the best full tight end in the game. Nothing against Dallas Clark, Antonio Gates and those guys, but they're receivers playing tight end. Heath is the best because he can also block. He blocks defensive ends sometimes; we ask him to do that, and pick up blitzes. That's why he's so special, he can do whatever we want. He's an extra lineman and a receiver. I see a big year ahead for him."