What the point of MR BLUE anyway? [Too many dogs]

I would dare to guess, because of his age, he had some special knowledge required for the job. Perhaps he once worked there and knows the ins and outs of the place, he could have even brought the job to the table. Maybe he was some old time safe cracker or whatnot. There could be many reasons why he was needed. On the flip side perhaps he wasnt needed at all, maybe Eddie was repaying a favor and giving the guy a job. Perhaps he was forced to do the job to repay some debt. Maybe bad ass mother fuckers who dont know each other are hard to come by? Who the fuck knows or cares? Bluh!