User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-4388405-20121006181920/@comment-4515675-20121006213249

Didn't Leo say that they should have gotten to CJ sooner but his work on the Argo II kept being sabotaged? Yet they were in CHB and they should have been protected. Also, Leo was possessed before Percy and Jason. It's clear that it happened before the Argo II landed and Percy was not on board then.

I think they've controlled Jason first because for a short amount of time Jason's spirit left his body and without the spirit it would have been much easier to posses him.

I don't know, I just think the coincidence is too great and again their eyes are described as being glazed and gold, nothing more or less. I just find it surprising that RR would have just added that Jason's eyes turned pure gold and then they disappeared.