I'm still leaning towards BT setting up the murder himself.
1. Scheduled it for NY so that it will be far away from his wife and kids. He knows it will be bad for them either way, but setting it up in NY is almost like a buffer between the two places so that locals don't have to deal with it, hence involving his family. Anyone looking to kill him would find it easier in the small suburb in Minnesota: less cameras, less traffic, less police experience in these kinds of killings. So much easier in Maple Grove, Minnesota than NYC, NY.
2. He was under investigation with insider trading. Maybe he was afraid the money would be taken from him, thus his kids and estranged wife would be left with nothing, plus the shame of him being found guilty and possibly going to jail. He would rather die than go to jail or his boys be ashamed of him. Plus he had life insurance going to them.
3. Shooter had no qualms about going to Starbucks less than 30 minutes before shooting. He had no worries about "missing" the timeframe of BT walking out, so he knew absolutely what time BT would walk out. How? Only BT would know as no one was with him. Even if a bellman would tip him off, he sure as heck would not be hanging out getting a latte and missing the chance when bellman would call him with the tip "Hey, he just got off the elevator." I think he was on the phone with BT himself who said "I'm heading down right now. And I've got on a bright blue blazer."
4. BT wore a bright blue jacket -- not something a CEO going to a conference would wear. Plus it was frigid. BT worth millions. Would have had a nice suit, plus overcoat. And I don't think BT had any kind of bag with him. Most people going to a daylong conference would have his laptop bag. I think BT knew he was NOT going to need his laptop, so he left it behind. BT was 50 years old. Young enough to be very techy savvy. My adult kids and my husband all rely on their laptops at work: leaving it in a hotel room while going off to work for a day in NYC would make no sense at all.
5. Hitman was in NYC for 10 days. I think he was given $$ ahead of time. Thought, well, I might as well visit NYC because they will be looking for me afterwards, so I'll just go early and see the sights. BT was in town for just one day conference, so it's not like Hitman was looking at BT's regular activity for ten days.
6. Bullets being labeled was a setup to let everyone think it's a disgruntled insurancee or their family member.
7. BT used to have security. Why not in NYC?
8. Hitman seemed too casual to be on a personal vendetta. More of a professional hitman who knew he had a job to do, but was experienced enough that this was not too big of a deal. If I was wanting revenge for a loved one or for myself, I would be focused on getting the job done: in Maple Grove closer to his home so his loved ones could experience the pain I had closer to them, not seeing the sights in NYC, not smiling at the hostel employee, not smiling at all. NYC is way too expensive to do a hit there and everyone knows there are cameras everywhere. Doing it in Maple Grove would have been so much easier and less newsworthy.
All JMO