Smackdown
It debuted on August 26, 1999.
In 1999.
April 29th 1999
It was an acronym Chris Jericho used when he debuted with the WWE (then WWF). He debuted near the turn of the millenium, so Y2J is a play on the Y2K scare from 1999-2000
Big Show has already returned to the WWE. he is currently feuding with Randy Orton and Triple H as part of the Authority storyline. He is scheduled to face Randy Orton for the WWE championship tomorrow - 24th Nov during the Survivor Series pay per view
Layla debuted in WWE in 2006.
WWE Monday Night Raw first aired in 1993 with The Undertaker being the only current superstar to still be with the WWE to have wrestled on the first Raw show, Smackdown first aired in 1999
No, not even close. Raw debuted in 1993 and while 24 seasons [as of 2017] is impressive there are dozens of shows in America & worldwide that have lasted decades longer than Raw.
Edge debuted on June 22, 1998
Rey Mysterio debuted in the WWE on July 25, 2002.
He Debuted in 2006
It debuted on January 11, 1993.