I don't see how making him sit on a bench every Saturday is going to make him any more ready.
If he's good enough, get him in the team. I would assume the management feel he is, considering he got a 3-year deal, so let's give him a run in the side. It's worked for a number of young defenders in the past. Hammell, Paul Quinn, Mark Reynolds to name a few.
Law has done ok (otherwise known as being the least shite of the back 4), but I'd get rid, along with Ramsden & Reid.