HUm You may very well want to check Your flywheel & convertor bolts. This too will give you a Unwanted rattle.knock sound. Esp If it is the flywheel/flex Plate Bolts.
And No the cam gear would not come 100% off the cam Unless it pushed itself through the cover.

Larry/Twisted6
[oooooo] smile
Adding CFM adds boost smile
shocked God doesn't like ugly.