Why don't more cops recognise the identity of the Man on a Ledge?

This is what I think...

Cassidy goes to such lengths to destroy his prints, because he knew that his identity would become public as sooner or later he will be recognized, thus this will buy him some time and his brother could work in the other building easily. This can be proven in the scene when cops are able to identify him, they immediately send men in the building where Cassidy's brother is.

More cops didn't recognize him sooner despite the fact that he was well known for the robbery is because that robbery happened 2 years before he stood up on the ledge. Plus till the helicopter comes around and shows his face on camera, not many were able to see his face.

According to me its not an inconsistency but shows the human tendency to forget things as time goes by...