From listening to a couple of interviews from the lady across the street she answered both questions. She has lived there 3 years, he, longer. He was home a lot working on cars in the driveway (her house is across the street from the back of his house so facing his garage). He also only opened the garage door about a foot or so off the ground, never all the way up. He'd "roll" in or out. She just figured it was broken and wouldn't go up any higher. It never entered her mind that he was hiding something nefarious inside.
He was also outside a fair bit playing with his son and dog, playing with his drone, and with his son while be played on the trampoline he got him.
As for being the "creepy" neighbor guy... he was definitely not friendly and "very to himself" and "a little weird". She even called him "mountain-man-ish". She went over one day to introduce herself and he pretty much barked at her and was NOT friendly in the least. She got the hint, left, and didn't attempt conversation again.
A neighbor saw something drop off the back of his truck (a "huge thing of hand sanitizer") so he retrieved it and went to his front door. He knew the guy was home because he had just seen him come home with his kid so he knew he was in there. Dude wouldn't acknowledge that someone was knocking at his door. The guy left it on his porch and was walking down the sidewalk when TH finally opened the door with a gruff "What! Why are you here!?". He explained he saw something fall off his truck and returned it. TH just picked it up and slammed the door closed.
Pizza guy said he'd always ask them to come inside for the tip (several people do that so it's not unusual) but it was "weird with this guy". Weird as in a "bad vibe, quiet, people usually invite you into their living room because they want to talk to you. He'd be silent after I walked in".
Hidden True Crime Interview that was posted upthread-
Neighbor (Missy) and Pizza guy -
Excelsior Springs Police Department Investigating Kidnapping