I think this case it’s also what you know. He deeply understands the booking engines (from memory Amadeus) and the airline side commands and data fields better than almost all TAs
Most TAs don’t deeply understand what they are doing anymore, outsourcing ticketing but also relying on the GUI functionality overlaid on the GDS, which often lacks the intricacies of the DOS-style commands.
On top of that he reads and understands the routing rules and can spot where that may leave room for either issues or advantage.
I work as a TA and still refer people to him!