Well sure he could use it, duh. But I don't understand why they didn't have him use it. but, good question, I was going to ask the same thing.
"They'll hunt me; They'll condemn me; Set the dogs on me; Because that's what needs to happen. Because sometimes, the truth isn't good enough. Sometimes, people deserve more. Sometimes, people deserve to have their faith rewarded. Not because they want to, not because of chance, but because they deserve to."
-Batman (From TDK)