Even though Jason knew that he shouldn't waste his time, he wanted to spend some of it with experimenting different things.
The Dragon mother's corpse was perfect for this as it reacted to his presence.
It was not as if he wanted to dissect the corpse.
Rather, he felt a faint connection to it, which made him believe that his soul world core required it for something.
He didn't think that there would be a problem with it as the Dragon mother and the eggs of the Eradica dragon would be together, at the end of the day.
This might be a little bit far-fetched, but it was also something that eased his mind tremendously.
After the Queen had departed, Jason resumed his work and was flying above the totally destroyed continent, smiling wryly as Solaris emerged from his body.
Without having been asked to, the black origin flame had decided to get its work started.