So really, if there was a witness who actually saw someone else, a second person near the Horman truck, then maintenance man story makes perfect since. He is in the field 0745 thru 0830.
Mystery Person # 2 has keys to truck, and after TH arrives at school and her & Kyron go into the school, person # 2 gets in and drives around, maybe went for coffee....until, waiting for a call perhaps from TH as to when to pull up to the designated meeting spot, the access road, and pick up Kyron. Which would be 0845 up to 0900, per TH email, she left @ 0900.
The maintenance man does drive a white truck, however it is clearly marked City of Portland with the well known Rose Medallion decals on the side that city vehicles sometimes sport. Also, had huge mesh screen on back window, tool box, and kind of beat up looking, with cones, other equipment in back bed. Has distinctive government license plate, colored yellow/orange, which other oregon cars do not use. And, not a double cab truck.