It's been well-documented that the number one reason the bigger WCW guys (Hogan, Nash, Sting, Goldberg, ...) weren't involved with the Invasion was because they were under contract to AOL Time Warner and Vince only offered them 50 cents on the dollar to buy out their contracts. Given a choice between sitting on their butts for full pay and "working" for half pay, they took the money.
THANK YOU
At least someone in here knows what they are talking about. WWE could not have used any of the guys that you have listed because they were already signed to contracts elsewhere, and would have lost money had they joined the WWE for the Invasion. Knowing how money-driven guys like Hogan, Steiner and Nash are, do you really think that they would have ever considered signing for Vince for less money? It was no coincidence that they all jumped to the WWE as soon as they were available- for even more money probably.
They would definitely have made the invasion better, and for that reason I believe the WWE should have held off the storyline until WCW could have been made a viable threat to the WWF. You wouldnt eve have needed ECW to be involved if WCW was strong enough on its own, without guys like Hugh Morrus and Hurricane.
However, Vince obviously wanted to go with it as soon as he had bought out the competition, to bury them once again while WCW still meant something to the fans, his ego would not let him wait, even though the storyline would have been a guaranteed money spinner, and one of the biggest of all time.
I still loved it, but it could have been so much better. I would personally have waited until Nash, Rey, Hogan, Hall, Godlberg, Flair, Sting etc were all available, and I would have liked to have seen Scott Steiner, Vampiro, Juventud Guerrera and Stevie Ray (Harlem Heat baby!) involved.
The teams could have looked like this.
WWF
Austin, Undertaker, Kane, The Rock, Kurt Angle, Chris Jericho, Big Show, Chris Benoit
WCW
Hulk Hogan, Kevin Nash, Goldberg, Ric Flair, Sting, Scott Steiner, Booker T, DDP
There could have been better cruiserweight action, with Mysterio and Juvi going up against the best of the WWE, and wrestlers such as Mike Awesome, Lance Storm and so many others should have been properly used.
So many possibilities....no wonder wrestling was at its absolute peak at this point in my eyes.