OK, so my last article may not have been activated, but let's just do this.
So The Lion Guard Timeline is something to discuss, specifically Kion. According to Ford Riley, TLG takes place after Kiara meets Kovu, but before her first hunt, so let's delve into the entire timeline.
At the end of The Lion King, we see the presentation of Simba and Nala's newborn cub.
In The Lion King II: Simba's Pride, we see the presentation of Simba and Nala's newborn daughter Kiara.
At the beginning of The Lion King II, Kiara meets Kovu, the son of Zira, before being separated by their parents
A few months after Kiara meets Kovu, Kion, the son of Simba and Nala is born.
Kion grows up into a young cub, and meets and befriends Bunga, a honey badger, the adoptive nephew of Timon and Pumbaa
In The Lion Guard: Return of the Roar, Kion gains the power of the Roar of the Elders, and becomes the leader of The Lion Guard, tasked with protecting the Pride Lands, and defending the Circle of Life
Sometime after Return of the Roar, Kion continues his role as leader of the Lion Guard.
Now flash foward 3 years later. Kion is a young adult and continues his role as leader of The Lion Guard. He is not present during Kiara's first hunt. Here's my theory. Kion wanted to continue a life of his own, nd discover his own path, so he disbanded the guard, and left Pride Rock before Kiara's first hunt.
Kion was born after Kiara met Kovu, and left Pride Rock to start his own Pride before Kiara's first hunt.