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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.
Original hmm ... I don't think codewars has a storage limit or disk limit for more <10kb datas . Anyway , from what i know base theme of Codewars is practice makes perfect . so having completed many katas that requires sort list with different keys will help to practice . People can always ignore them if they think they are on high level . And he made this kata and cases ( better than copying from sites ) so i think discouraging him is a bad idea . maybe he can create some awesome kata's in future