[Andreas]

Hirelings can be loyal, exceptionally skilled and willing to take risks. It is just expensive/time consuming/unreliable to obtain such hirelings. From what I remember about Alfred though, someone like him is well within the capabilities of people as rich as batman to eventually obtain.

Allowing someone to get such a hireling during play is entirly reasonable if the character puts in the appropriate level of effort. I would probably also allow someone to start play with such a hireling, provided that a huge amount of money is spent on it (which can represent things such as having previously hired a large number of people and selected the best among them).

In this particular case, Alfred could be either an Ally or a hierling. The easiest way to tell might be to examine if Alfred happens to become more powerful whenever Batman does (since Allies automatically stay at a CP value proportionate to the character's).