I'm confused. How do we know that Crane was in Arkham? I understand he was put there in Begins but how do we know after he was caught in TDK that he was put back there? Of course, we can speculate, but I like proof instead Wouldn't matter either way as Bane could bust out anyone he wanted by that point in TDKR, no explanation needed. Plus I really don't read too much into the cameo's of the Scarecrow in TDK or in TDKR as part of some great Shakepearan act by Nolan. He had him in there for pure fun and fan service. Both movies would have been just as fine without him.