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I've always held the suspicion that some wrestlers have a sort of reverse elevator boots they wear for some occasions to make themselves appear shorter in relation to another wrestler. Like a boot with a 1/4" sole in it that is almost like walking bare foot.
So someone like Undertaker would wear that here and AJ would wear shoes with thick heels on them to make the difference in height less to make the match more believable.
I *know* in many cases interviewers take off their shoes to make a wrestler look taller, and some wrestlers stand on boxes not shown on camera.