The Anomalies.

"So Legion tried to reincarnate into 9 bodies. 7 succeeded while the 1 for Phoenix race failed. Ironic enough, the Phoenix clone went to the spiritual dimension and survived while the demon clone died within the egg. This is some interesting stuff."

Everything was laid bare before him. He saw everything from when Gehaldirah Oakstein was born up to his successful reincarnation. He also saw the history of each clone. 

One thing that stood out to him was the survival of Legion-7 against all odds while the demon clone died. He is certain the demon clone died because his history disappeared completely after a few years in the egg. 

The death of the demon clone didn't give him pause so Draco continued looking through the history of the other clones. He didn't need to search for a long while before finding the issue.