@Chen Zen - I'm glad you like my view on the matter.
However, before a student can choose a couple of kata that he/she might delve deeper into, he/she should be introduced to a certain curriculum (we have a total of 14 kata, 3 being kihon(fundamentals/basics) kata that are learnt for the 3 different belt colours before shodan/BB and 8 that the student is introduced to before BB).
The student can then get a feel about what kata suit him/her based personal preferences.
Then one or two can become their main focus points in regards to kata (deeper study).
This will aid their other kata aswell, since many techniques and combination and therefor applications aren't unique to a single kata.