The Three Filthy Sons, "Flesh", "Shadow", "Birth", these three entities, in reality, are not getting along.
All along, the three major factions of monsters have been distinct from each other.
If the Lord of Heaven does not appear, these three newly condensed Cosmic Rank supremes might fight among themselves... This possibility exists, and it's not small.
But the Lord of Heaven descended without delay.
"The possibility of the Three Filthy Sons fighting among themselves is just one of the probabilities. Once they choose not to fight but instead hide away directly, then..."
He would be unable to find them.
How easy is it to find a supreme whose sole intention is to conceal its whereabouts?
Now, as their Cosmic Rank has just condensed, they are exceptionally dazzling and conspicuous, and this is also when the Three Filthy Sons are most vulnerable and easiest to locate.
Moreover,
the Lord of Heaven has another concern.