In fact, it's quite easy to notice this, and many people on the internet have realized it too.
The stronger and more potential a Spirit Beast has, the more capacity it occupies in the Sea of Spirit.
Even Du Qing of Talent Sequence 437 has only contracted one Purple and two Blues, and even if he reached Three-Star, he probably wouldn't consider contracting another one.
After all, by then, it would evolve into a three-Purple lineup, occupying even more capacity.
Moreover, he is a true disciple of the Celestial Star Sect, needing to inscribe various Spirit Patterns, making his Sea of Spirit considerably tight.
And this Mu Shunying, just from the photos of him circulating online, possesses no less than ten, all of which, without exception, are Blue Elite Level and above.
Among them, there are even two Purple Legendary Level Spirit Beasts.
