Dorian Yates isn't even close. Neither is Mark Dugdale or Ronnie in 2002. Claude Groulx and Ahmad Haider win the "smallest arms" awards for male competitors in the last two decades. Proportionately, Art Atwood might take them all.
Before that, poor Chris Dickerson took "top" honors. (How he ever won an Olympia's beyond me. I hear he's a sweet man, but I'm sorry: slowly moving one's arms about in circles doesn't make for great posing, either. You want good posing? See Shawn Ray in 1994.)