This is truly poetic in so many ways, with so much foreshadowing to blood chains form.
1. Ichigo first ever utilizing Bankai, showcasing Tensa Zangetsu & at the hilt end of the sword, you see the chain.
2. Being the introduction of the Dangai form with the chain wrap around his arm.
Now within the anime, we’re seeing a new introduction of the Blood Chains form! We all gotta thank Kubo for this.