I think he should have to develop his detective skills first.....I liked the fact that he wasn't the ultimate hero right off the (ahem) bat. Having him mess up, stumble, search his way around how to do things makes it SO much better when he finally does become the Detective we all know
I just figured that was what he was studying at college before he went abroad. Plus his initial martial arts training he was doing probably from a very early age. That's what I loved about Batman....he earns his skills, he doesn't magically get them. Take the spiderman movie: Peter gets bitten by a superspider that gives him his spidey skills....that's fine, but it doesn't explain why he suddenly knows how to fight.
Chris
the ultimate spider-man series provides some good insight into this. in that series, Peter got his butt kicked alot early on.