Maybe but those doors have been opened long ago for crops of less than all-time great fighters in other divisions and era's so it wouldn't be as if it was him that set the precedent.Notably the heavyweights seem to be held to a different standard than everyone else by canastota. By the standards the hall has set of course he's deserving, though i agree with the jist of your post.
Johnson was undersized and generally quite ordinary at 175 imo.He never seemed as if he was really too interested post-Jones shutout and had taken advantage of one of the worst champions ever in Guthrie to get the belt. Even old coked up cruiser Nunn subsequently smashed Guthrie to bits.