For a God to resurrect, not only would they need enough bones, but having most of the God's body was indispensable, especially for something as grand as a resurrection. If an important organ was missing, then the resurrection would be a joke.
And even if Lin Yun had known earlier, he wouldn't have cared where Constance's body was. He only needed Constance's skull.
Constance's skull was the last piece of the puzzle he needed before he could advance to the Archmage realm!
That was the most perfect set up he could think of. As long as he fused with Constance's skull, he would be able to immediately advance to the Archmage realm, and he would have a smooth path through the entirety of the Archmage realm.
Moreover, Lin Yun knew that Constance hadn't resurrected, because Constance's God Nation had been forcibly opened during the peak of the Magic Era.
