McGyver wasn't the best friend. McGyver wasn't a business partner. McGyver is a bit more "arms-length" than CM, IMO.
To not call, text, go over, ask a neighbour if they'd seen them, call again, leave messages, emails, etc is absurd for someone who was entirely engaged with this family. After they were dead, he didn't call, except for that pretender 2-in-a-minute deal. Especially in light of giving MSM the cheques that he was supposedly told by JM to do. And more to the point, no messages to JM for customers wanting to get paid, no VM's explaining he'd paid himself the money he was supposedly owed, paid for the Saudi Arabia final, etc etc etc. Nada, zero.