The commotion of a Sect rising up to a new Heaven should have been great, and it was. However, as focused and shocked as everyone would usually be when such a thing happened, it was hard to be this time around because too much was going on.
Ryu's breakthrough wasn't the only one happening across the world, and for the Eighth Heaven, there was an especially large bottleneck.
The highest concentration of talent in the True Martial World was located in the Ninth Heaven, obviously. However, the largest concentration of suppressed talents was most definitely located in the Eighth Heaven.
The Ninth Heaven was once thought to be the only Heaven without any suppressive formations in the past, and while this was no longer true as proven by Ryu, the Eighth Heaven still housed the most unsung heroes.