Some more clarification regarding the various Memphis groups based on my memory and a tad bit of research.
MPPW was the first one in 1999 to use developmental talent. That's where Baldo, Angle, O'Grady, etc. were. I think when Lawler's relationship with WWE soured over Stacy, as mentioned above, led them to move the talent to MCW, which was already up & running. Terry Golden ran that and Bobby Eaton was a very short-lived trainer there. Not sure the timing of all that but MCW was the primary one by early 2001 at least. The Hass Bros, Reckless Youth, Island Boys, Steve Bradley with Victoria, Mean Street Posse, etc. worked there at the time. The Regal/Danielson match in question was early 2001. Sometime soon thereafter Lawler mended fences with WWE and the same talent worked MPPW TV and MCW shows. I'm fuzzy on the details of whether those were kept separate promotions but soon there after they pulled the talent from Memphis completely as those same guys ended up in HWA with the WCW guys.
Re: HWA, Les Thatcher hasn't owned it since 2003 per Cagematch.net.