Quote Originally Posted by Ryllharu
It seemed like Ran Fan and whatshisface could tell that Gluttony had many "lives" within him. Perhaps they are sensing something like ki?
Since Xing is depicted as an Oriental country, my guess is the same. The old ninja also commented on not being able to sense Al's flow of energy when they chased him back in Rush Valley.

It's interesting that they pinpointed Gluttony and kicked him in the face, but didn't notice Bradley until he spoke, suggesting that an aging Homunculus is structurally different from an immortal one.

Either that, or they were so fascinated with Gluttony's tongue they don't notice badassary until it hits them in the face.