USHER BEING SUED FOR ALLEGEDLY STEALING HIT SONG FROM CONFESSION ALBUM 'CAUGHT UP'

Three men who claim they wrote a song called "Caught Up" back in 2002
are accusing Usher of lifting their work.

Their song is about a man lost in love. Usher recorded a song two
years later called "Caught Up," which is also about a man lost in
love. It blew up the charts and was featured on his album,
"Confessions."
The guys - Zacharia Edwards, Mitch Moses and Vince McClean - claim
they played it for an exec at Arista Records - Usher's label - and the
guy then played it for LA Reid. The men never heard from the label
again, but a couple of years later they heard the song on the radio.
They're suing for unspecified damages.
Source: Tmz

My question now is, why didn't the three men speak up since 2002 when
the song was released, why bringing it up in 2013, eleven years later?