Could you post pictures of this, would like to see it as I'm also running an ATI albeit without any issues so far. Just want to be prepared in case anything happens.Thanks!

 

@RedSky455, I wish I'd had my wits about me - I failed to take a picture. I'll describe it though.

There was a groove dug into the timing chain cover about 1 mm deep that matches the outer edge of the ATI damper, only on the top. Looking at the timing chain cover, straight on, the groove was from probably 10 - 2 o'clock, only. It was deepest at the 10 o'clock point, and disappeared at the 2 o'clock point.
Interestingly, there is no visible damage to the ATI damper, unless there's a surface flaw that I missed.

Let's hope this helps someone else decipher this tricky problem down the road. The parts are comparable in cost to a timing chain repair, but it's a 2 hour job to change a damper, vice 4-6 or more for a full timing chain service - at least for me, in my driveway...