You can't expect mid-round picks from small schools to all hatch into game-ready NFL starters. Hopefully, though, you'll see some signs early that they're scratching at that shell and trying to break out. Maybe in year two, they're little hatchlings. Too weak to fly on their own, but you can see that one day they probably will. If you're three years in, and the egg isn't showing any signs of life yet, you're probably sitting on a dud. And there's not that much room in the nest.
I think we'd all agree that Arkin needs to break out of the shell this training camp, and that it's not necessarily looking all that likely he's going to. At the end of camp is the appropriate time to kick him out of the nest if he's not showing significant signs of becoming an NFL-capable player.