I thought I saw a quote that said there was more to come, so it could be possible that they are convincing some legends as we speak.
Here's another list on who NOT in the game....
Jim Brown
Bo Jackson
Randall Cunningham
Chris Carter
Bruce Smith
Jim Kelly
Fran Tarkenton
Franco Harris
Terry Bradshaw
John Stallworth
Lynn Swann
Joe Greene
Mercury Morris
Larry Czonka
Terrell Davis
Marshall Faulk
Don Hutson
Deion Sanders
Steve Young
Michael Irvin
Dan Fouts
Mel Blount
Kellen Winslow
Ozzie Newsome
Lawrence Taylor
Donnie Shell
Steve Atwater
Ricky Jackson
Kevin Greene
Sam Mills
Pat Swilling
Dan Diedorf
Doug Williams
Eric Metcalf
Jack Ham
Shannon Sharpe
Darrell Greene
Mark Clayton
John Riggins
Drew Bledsoe
George Blanda
Allan Page
Tony Dorsett
Art Monk