Hunter was definitely an excellent workhorse in his prime, there's no denying that. But Hunter pitched in a pitcher's era, in a pitcher's park, with great defensive support. Few have shown the feats of durability through innings and complete games that Hunter did during his prime. But while his ability and willingness to go deep into games took care of one factor, it was the context he pitched in that most contributed to those zeroes.
Let's say Hunter not only pitched to contact, but that he was great at pitching to spots where, when the ball was put in play, his fielders could best take advantage. It seems that if he was so great at taking advantage of his defense, then that park and era adjusted ERA+ of 105 should have been a lot better. Considering he was never a great pitcher at his best, even if I gave him full credit for pitching to the score, and assume his intangibles are better than the most Derek Jeter has been credited with, he would zoom all the way up to just outside my personal Hall. I can bend over backwards to accommodate Hunter's candidacy, but I can't support him.