Maybe? Wow. You just have no humility, do you?
Funny, I just looked at the film, and he, Nicholson (5'9.75") and Basinger (5'7") are about the same size. I don't say something unless I'm sure I know what I'm talking about, bud. He's much taller than Whul (5'7"), he's taller than Gough (5'9"). Walken (6') was taller, yes. And he never shared a scene with Michael Murphy (6'1").
Sorry to break it to you, but news reports from 1989 report him at 5'10", just the same as every site on the internet. And yes, I have seen these news clips.
Half the people you listed there (I've already proven you wrong so I'm not going to go persion-to-person), he's the same height as, or taller. In Beetlejuice, he was intentionally hunching over, so you can't count that.
Once again, I've completely flattened your argument. But yes, I get it. He's short for Batman. I never denied that. But he isn't short, period. 5'10" is considered average height, ask anybody. Most men clock in about there. You just can't handle that he is 5'10", so you try to deny its validity.
But hey, I ain't trying to get you to accept Keaton. I don't care how you feel about him. Just realize the stuff you were saying about him was wrong.