T-Rex: Batman, who was the world's greatest BAT-THEMED detective, realized he was much more than that too!

T-Rex: He was, for instance, also the world's greatest bat-themed FIGHTER!

T-Rex: Heck, he was the world's greatest bat-themed driver - and pilot too.
Dromiceiomimus: Not a lot of competition there, I think.
T-Rex: My point exactly! He chose an odd theme - bats - and it let him be best in the world at EVERYTHING HE DID WITH THAT THEME, thanks to a lack of competition!!

Utahraptor: And thanks to his decades of training, putting him in peak physical condition.
T-Rex: Sure!

T-Rex: But for you and me, who have spent decades of NOT training, putting us in OFF-PEAK physical condition, it shows how WE can still be best in the world at something too! We just need an unpopular theme, and we're set!
Utahraptor: All we need is something NOBODY likes!!

Narrator: AND THUS:
Off panel: Hello, is this the Flooded-Basement Themed Detective Agency?
T-Rex: We're the best there is at what we do, but what we do isn't very popular!