I don’t think there’s any question that Molina is one of the top 6 defensive catchers of all time. The thing is, of the others on the same defensive level as him, the ones in the Hall - Bench, Carter, Pudge - were significantly better hitters than him. The ones that are not in the Hall - Boone, Sundberg - were significantly worse hitters than Molina. Molina has been a just below average MLB hitter (98 OPS+) for his career. Does that get you in the Hall? He’s a great defensive player, but he’s not on another level the way that Ozzie Smith was at shortstop. Posey, Russell Martin, and Mauer (even when only counting his years as primarily a catcher) have all been more valuable than Molina.