okay maybe it wasn't his debut, but he had a match with Taker where taker destroy him. Heck even Takers wife was beating him up.
Yes Goldberg did win it a month later, but leading into the Chamber Goldberg was gaining a lot of momentum. Tho many say he wasn't being the Goldberg of WCW and was kinda just a poor wwe version. But He was getting a huge pop in the match and heck he was starting to be like he was in WCW, just on a path of mayhem. Then Triple H wins the match. Yeah Goldberg won it the month later, but he really wasn't the same or satisfying as it could have been if he won it at Summerslam. Just like Punk. Yeah Punk won it a few months later after that stupid cash in from ADR, but Punk's momentum was never the same.