As far as the 'WCW 24' package is concerned, I actually used to have it written down somewhere, but threw it out. Thankfully, I found a Q&A at Pro Wrestling Insider from April of last year.
As said, DDP came along later, as did Booker T, Kanyon, Bagwell, and Torrie. As I recall, both DDP and Booker had to accept contract buyouts. Booker pretty much jumped ship right away, while DDP waited it out a bit, but soon followed suit. Kanyon and Bagwell were waiting a short time for their contracts to expire. Likewise, Kidman and KroniK, who also signed around the same time, had to wait it out in some form or another. I doubt WWF ever really had designs on picking up Bagwell, but when his contract came up they probably figured, 'Why not?'
Torrie was already a free agent, having already been fired by WCW when they purged the women's roster months before the buyout, leaving Stacy as just about the only woman left.
Here's the list from PWI: