Example generation. Given an exercise, we need someone who can think of lots of specific examples from real life or important real-world domains, which illustrate the exact intended point and not something almost-like the intended point. E.g., turn "Sunk cost fallacy" into 20 story snippets like "Lara is playing poker and has bet $200 in previous rounds..." (Our experience shows that this is a key bottleneck in writing a kata, and a surprisingly separate capacity from coming up with the first exercise.)

...so, who else just opened up Evernote and started seeing how many they could bang out?