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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.
Senior in this case means the restricted division for people who are old and bad. If an old person has a good handicap they play in the Open division.
Man, you wrote that the better the skill, the lower the rank => rank -2 - 7 the better players(Seniors). But in output you expect completely different result.