One thing I would like to know (and never will) is how much influence each named GM has on his team's picks. Of course it will vary, but I bet there are plenty who just go to the scouts and say "Who should we pick?" and just go with that (if there's consensus). I bet some GMs never bother to watch much tape. Just as players have different strengths, GMs do, whether it be negotiating with agents, bargaining with other teams in trades, making sure the franchise is a money-making enterprise, whatever. Neil reminds me of one of those bureaucrats who has worked out the people he needs to please to keep his job and is VERY good at that. He also seems to like to insert himself into "special occasions" - like Melo's scoring achievement last season.
Can't speak for all GMs, but for awhile worked close enough with about 10 of them to tell you that in most cases, this is absolutely not how it works, certainly not with consequential picks. Scouts have their role (detailed input on players), analysts have theirs (trends in the league, what they're "hearing", etc.) , data guys have theirs, coaching staff has theirs (player fit, roster strengths/weaknesses), cap gurus theirs, medical and psych staff theirs (red flags, mostly) and the GM has to manage those teams, develop the overall strategy have and manage the larger picture, etc. At the end of the day, the decision is on the GM's shoulders, so any worth a damn is going to have a lot of involvement in the final decision, based on the inputs above as well as their own scouting (they're on the road a TON).