I agree, I could see Dorsey moving to an end pretty easily, he has the build for it in a 3-4. I think right now, the odd man out if Hali. We could trade him, but I think Hali could potentially move to a linebacker position. If that was the case, with a stronger up front DL, then Hali could turn into that pass rushing LB we are all hoping for. He is not a speedster, but he could do well if he did not have to engage linemen face to face every down.
Anyway, to the original question. I think Dorsey has to move outside now to be able to play for this team. If he does not make that transition, he will be traded to a 4-3 defense team.