#1 Hulk Hogan didn't want to work with a new opponent
Hulk Hogan was ruling the '80s and 90s era with his crazy American Hero gimmick.
When WCW signed Hogan, he didn't want to work with some new guy on the first edition of Nitro since he thought it would not be appropriate.
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Eric Bischoff revealed that Hogan was very conscious about who should be his first opponent since he wanted to work with someone from the past who he already has a connection with and could propose something amazing to the audience on the first night of the show.
Therefore, Hogan fought Big Boss Man on that night.
Surprisingly, Hogan's initial feud in WWE was also Big Boss Man, though with a different gimmick.