If I may put my two cents here, I don't see on the footage any prosthetic limbs. I see a small person, wearing bulky, heavy gear they are not used too and shoes that are clearly too big. I waddle in exactly the same manner whenever I borrow my mom's rubber boots, which are much too big for my feet. The perp, IMO seems to be not very comfortable in this gear, therefore moving in a clumsy manner.
From the very first moment I've read about Missy's murder, I couldn't fight the feeling that it's somehow computer-game like. The perp wanders around the church, checking the rooms and closets as if he was in a game, looking for stuff to their inventory. I have no idea if Missy's murder was a part of the perp's fantasy, or was unplanned, but if it was a premeditated murder, targetting specifically Missy, wouldn''t the perp dress himself in something more comfy, alloving him to move faster and swiftier? And something less catching attention than a freakin' SWAT gear. There are easier and less flashy ways to obliterate your face and body than that.
I feel there is something weirdly immature and teenage in this case.
