When Did Mike Tyson REALLY Win His First World Heavyweight Championship?

As the choices say, was it against Berbick for the WBC title, since the WBC is a legitimate world boxing organization? Was it against Smith for the WBA title, maybe since the WBA is the oldest legitimate world boxing organization? Was it against Tucker for the IBF title, since with this fight Tyson unified the title in winning all three major belts? Or was it against Michael Spinks, since Spinks was the true, never-retired, undefeated lineal champion in a reign that can be traced back to 1956?

I'm curious what the consensus on this board is. Discussion and debate is welcome.

 

I'm a linealist. I think the boxing organizations are crooked beyond belief and shouldn't be looked at as legitimate. The oldest alphabet title was the WBA title held by Bonecrusher Smith, dating back 8 years to John Tate winning its vacant belt against Gerrie Coetzee. Next was the WBC, which dated back a mere 2 1/2 years when Tim Witherspoon beat Greg Page for the vacant belt. And the IBF title line was only two months old, when Tony Tucker won the vacant belt against Buster Douglas.

Whereas Spinks' lineal title line can arguably be traced back to 1956, 32 years. Boxing titles should be about the "man who beat the man", not who some promoter and questionable organizational president decides. And I don't remember where I read it, but I do remember that Jim Jacobs and / or Bill Cayton, probably Jacobs, said that Tyson wouldn't be the real champion until he beat Spinks. I think that coming from the Tyson organization at the time, that means something.