First demolish the "organization" idea as being from God. Research it.
The idea of organizing in hierarchical groups came from Moises father in law, likely a Pagan, idolatrous man. God may have not refused the arrangement but it definitely did not come from God.
In the new testament, the idea of doing "everything by arrangement" is too simplistic of a statement to convert it to the uniformity you find today in the org. Jesus spoke exactly against this because the Jews of the time were more organized like the org of today and they drifted into legalism and dogmatism because of it. You see the same happening today. If Jesus came back today, what would he see?
When Acts speak of the apostles sending to the elders for a resolution on the blood issue, read it carefully. There is no way to conclude that these elders were the GB of the time beyond reasonable doubt. Put into context, every book of the bible from Acts forward, is centered around the argument between Jews and gentiles. The envoy sent to the elders regarding the blood issue was more of an advisory council between opposing groups. Basically an attempt to have the Jewish leader tell their followers to look the other way in matter of food and diet that were not to become issues for which people left the truth (sounds familiar?). I can expand on this more if it doesn't make sense.
On the issue of Dfing, again has to be read into context. Like I said before, the core of the gospels after Jesus' death concentrates on two things. a- was Jesus the messiah, and b-Is salvation only for Jews or does it include gentiles whom refuse to adopt Jewish ways. With that in mind, the "division" mentioned in the bible was not between the faithful. The division among family members would come from people who denied Jesus vs those who believed in him. Not among those who committed fornication vs those who did not (the wicked). Certainly if you did commit fornication you would be somewhat isolated but never to the degree that it is seen today in JW land. To put this in perspective, think about the division you see today between the pro-Trumps and the anti-Trumps. Families and friendships have been strained because of these differences. No one has mandated this division as a rule, but you can state it as a matter of fact that these arguments and divisions do take place. In other words, Jesus knew he was going to be a cause for division, but the statement he made never pointed out that a real Christian would embrace this as a test of loyalty. He never said you need to make sure to stay away from people who denied me. If it happens, well that is sad but certainly it is not a requirement.