You're right, ****, people with lots of experience never make mistakes or get surprised! How could I forget? It's not like anybody ever gets into a car accident after they learn how to parallel park!
No, my concern here is that if Yellow and Black's first "focus episode" moments are "Yellow does something stupid, triggers Black's sister complex"? That suggests the series wants us to get used to that as a foundational trait for both characters. Otherwise you put it off into the teens or 20s when you need to mark time.
Blearggh. I like Saint Seiya and all, but this tired old plot trigger is by far one of the franchise's crappiest legacies. I could go five million years never seeing another character defined by his stupid imouto complex again and die perfectly happy.
(In part because I would have somehow lived for five million years.)