Vince LOVED Johnny B. Badd in WCW. So he said "Bring me Johnny B. Badd!" so they bring in Johnny B. Badd. This goes to show you how badly Vince wanted Johnny B. Badd, he brought him in on a 6-figure guaruntee, while Steve Austin and Mick Foley were working on the old 10/150 deals. The problem is, 'Johnny B. Badd' was a WCW property. So Vince couldn't have Johnny B. Badd, and they couldn't just change his name, because WCW would fuck him over. To make matters worse, Marc Mero was only trained to be 'Johnny B. Badd', he was never actually trained to work.
So, they gave him the 'Wildman' Marc Mero gimmick, and it didn't get over. So, they tapped into his boxing background, because the dude was a legit golden gloves champ, with some horrifying knockouts to his name, and Steve Austin agreed to work him and give him some legitimacy. The problem there is, Vinces McMahon, and Russo were OBSESSED with Sable, and wanted her to be a big star, so they turned her babyface, and she powerbombed him, and he sold it.
Steve gets on the phone "Hey, I ain't working with Mero!" and Vince asked why, and Steve said "You expect me to sell for a guy who just got dropped by a 100lbs woman?! Not happening!"
Mero was done for there and then.