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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I agree with you. And as for me there is a logical straightforward way (without any tricks and bruteforce) to solve this kata in case of usage reflection/introspection abilities (intuitively or not). This is what I had thought when I saw your "What has been learned from this will be very helpful in the future".