Maybe that's a good sign... Grimble, Ivery, King, Moore, Pierre, Porter, and Luther might just be harder workers. I've heard rumblings that Briscoe wasn't working as hard as some of the other boys, so maybe this is a motivation move or perhaps the staff just doesn't think he has what it takes to be a DT? Unless he has impeccable footwork and a passion to play OL, it might be tough for him to crack into the two deep with the kinds of guys we have (and that we have coming in). Maybe it's just what he needs?
As for the other guys, i know they are unproven, but I can't help but be excited about them. Porter and Luther are from the last regime, but otherwise, you're talking about guys that were recruited by this staff. I know there is a question mark on Porter until he can prove himself durable enough to get through the summer and the whole season, but IF he can take that next step, I'm thoroughly excited. I think Pierre and Moore have the talent, tools, and game-time ferociousness to be upper tier DTs (not necessarily all-world, but a desirable compliment to a hypothetically healthy porter). Behind them, I think Luther can be a very good rotation guy. Grimble, with the added weight (and time to recover from injury), could probably start off as a 3rd down DT who has the motor to collapse the pocket and get a couple of sacks. At this point, I think King is a body that might be used situationally (or for garbage time), but I will reserve harsher criticism as he was forced to play young, and maybe he will develop into a solid rotation guy. I'm excited about Ivery, but just like Briscoe, I've heard rumblings that his off season wasn't as productive as the staff would have hoped for.