I have BIG QUESTION?
Which WCW Wrestler didn't get buried at their first Wrestle-mania?
Lex Luger's first Wrestlemania was 9 and he defeated Mr. Perfect
Mick Foley's first Wrestlemania was 13 and he teamed with another WCW Alum, Vader, and fought Owen Hart and the British Bulldog to a double DQ. So technically he did not get buried.
Steve Austin's first Wrestlemania was 12 and he defeated Savio Vega.
Vader's first Wrestlemania was also 12 and he teamed with Owen Hart and the Bulldog to defeat Yokozuna, Jake Roberts and Ahmed Johnson.
Chris Benoit and Chris Jericho both won their first Wrestlemania matches as did DDP if you're looking for a name that came after WCW folded.
Those were 7 guys who were well known as WCW guys before coming to the WWE. Undertaker would be another as he wrestled fr WCW for about a year and a half. I didn't include him though because he wasn't really a "WCW" wrestler as he first gained real fame in WWF. The other four were well established WCW guys before going to WWE.
That was fun answering. Thank you for asking