Q never TELLS anything, or perhaps he does! What he does is imply point in a direction, and lets us discover what we may, where then opinions can be formed and consensus be firmed up.
Why yes the DS can READ anything they want, but they have been trained to look for TELLS, not hints.
This must be organic, the learning, or other issues would prevent the spreading of information.
Re that picture of Santa on the elevator, has anyone thought that the image near the QA signature at the bottom, in the bright red section to the left, looks like dog tags hanging on a peg?