Not sure if this happened before the most recent changes, but I had a Dopleganger infiltrate my party. It cloned my Rogue. My Rogue has an 85% chance to Hide in Shadows. The Rogue Doppleganger had a 5% chance to Hide in Shadows. After finding that out, it was easy to determine which one to Party Attack.

Anyone else run into this case prior to the change log? I'm rerunning through the trilogy with a new party, checking out the Bestiary and Party stats.