Board Thread:Questions and Answers/@comment-1205866-20130206033718/@comment-4855155-20130303092446

It was also stated in the latest episode. By the fact he knew it was alien and therefore wouldn't use it. He still became his own version of the Blue Beetle just his costume was man made and his powers were science. He basically kept it locked up so it didn't have a chance to bond with another host or him.

My theory is that the scarab reacted to the explosion at the labs, and somehow it's programming kicked in. So it forcibly bonded with the first living being it could find, Jaime. But that's just my thought about that.