Like Bassai Sho the practitioner is apparently introduced to the concept of weapons defense (at 1:05). The kata also includes a 'sky viewing moment' at 1:23. This reverses the opening movement of Kanku Dai where the practitioner looks ahead; in this form the karateka is looking behind him.
This pattern is popular in competitions owing to its dynamic nature.
Master Kanazawa performing Kanku Sho