Even though his first plan is to explore the Giants Plane slowly but seeing the chaos that is now happening on Blue World and the news regarding the invasion of the outer world creatures, he had to hasten his plan.
He is confident that since the outer world creatures are attacking all the worlds that they had found, the higher plane of existence aren't an exception to this, matter of a fact, the invasion on the higher plane of existence might be much more brutal than those of the lower planes.
Gaia is safe, it is because it's barrier is now nonexistent, the barrier have fused with the gates of Divine Realm, the only way to invade is to go through the worlds that it is connected with.
Due rapid growth, there are multiple worlds that Gaia is connected to, on each world, he has a clone to monitor the development, even worlds that prevent beings from ascending to Xiantian Realm.