Even a bright, talented, highly educated non criminal is going to make mistakes. Like the vascular surgeon who killed the Tepe's.
I agree, we can no longer say that in the Guthrie case the perp is a kid, a druggie, an impulse crime, a street person, inexperienced, etc. You don't evade the FBI and 400 agents for this long if that were the case?
Most first time criminals, no matter how smart, make mistakes. So I am going to guess this is the not the first crime the guy has committed. At the least he had to do some dry runs, practice sessions.
Yes a methodical person. Meticulous about detail. Planned it carefully ahead of time. Often first time criminals plan the crime itself but not the exit plan. This guy planned it all looks like.
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The guy in this case is a careful thinker, but wider in scope that most deep thinkers. There are a lot of moving parts to this crime, many different pieces and he appears to have done well with all of them. Perhaps there is more than one person involved.