The Laughing Cavalier: Identity Revealed?

In this very special lecture from June 2013, Pieter Biesboer, Curator Emeritus of the Frans Hals Museum, proposed a solution to one of the Wallace Collection's greatest mysteries, the identity of The Laughing Cavalier. Listen to his case for one Tieleman Roosterman, a rich Haarlem merchant, and decide for yourself if the identity of the Museum's most famous resident has finally been revealed!

[@parislady1925]

I never understood the title because the man is not laughing but "smiling".
So why not "The Smiling Cavalier" would seem more accurate.