I would done something like this
WWF:
Mankind, Kane,Triple H, Undertaker, The Rock, Steve Austin, Shawn Michaels,
Hulk Hogan, Ultimate Warrior, Bret Hart, Ric Fair, RVD, Jim Neidhart and Lex Luger
WCW
Rey Mysterio Jr., Billy Kidman, Juvintud Guerrera, Bill Goldberg, DDP, Sting, Psicosis, Dean Malenko, Eddie Guerrero, Chris Benoit, Chris Jericho, Scott Hall and Kevin Nash.
ECW
Sandman, Rhino, Tommy Dreamer, Jeff Hardy, Shane Douglas, Sabu, Raven, Bam Bam Bigelow, Taz, Bubba Dudley, DVon Dudley, Big Dick Dudley, Spike Dudley and Dudley Dudley.
At the following Wrestle-maina Psicosis
Dean Malenko, Chavo Guerrero, Eddie Guerrero, Chris Benoit, Chris Jericho, Rey Mysterio Jr., Billy Kidman, Juvintud Guerrera, Psicosis Stold the belts of WWF. After WWF stold WCW and ECW titles.
At the next suvivor series would be WCW VS ECW VS WWF. Eric Bischoff came out of no where and made an new form of the NWO. ECW acting like they were friends to WWF up to the suvivor series event. Then ECW join forces with WCW and NWO. Vince's was getting mad as heck. So he'd made a new group of wrestlers and called them the WWE wrestlers to help WWF Wrestlers.
WWE:
John Cena, John Bradshaw Layfield, Santino Marella, Carlito Cool, Super Crazy, The Boogeyman, Randy Orton. Umaga, The Great Khali, Paul Burchill, William Regal, Batista, Chris Master and Matt Hardy.
NWO:
Stevie Ray, X-Pac, Scott Steiner, Sid Vicious, Macho Man, Scott Norton, Brian Adams, Jeff Jarrett, Buff Bagwell, Curt Hennig, Booker T, Horace Hogan, Big Show and Konnan.
WWE & WWF VS NWO/WCW/ECW. When it came down to WWE & WWF.
WWF got screw by WWE Wrestlers.