It's classic uncreative EU writing. This character in this one scene was in this role? Guess what, There's a whole planet of those characters, and they're all experts in the thing that one character was!

Bothans were spies once in a throwaway line? All Bothans are expert spies!

Boba Fett has snazzy armour? There's a whole planet of people that wear that exact suit of armour

Admiral Ackbar captained a ship? There's a whole planet of him that builds ships exactly like that one, and they're known for their spacefleet!