Great one!
I wanted to go trough something similar to this... and probably will do some time in the future.
The last 3 to 4 years, with 100 million of steem distributed did a great job in decentralization of the chain, although the start was very bad with a lot of centralization. 80% in on subject. Now days that subject has around 25% share, but on the old chain. Here its non existant. The largest stakeholder, freedom has around 5% share, the second one around 2%. For example block.one on eos also has around 5%, and the next close ones in the range 4 to 5%. But a lot od the coins overall are in few hands as you noted.
Not totaly sure about bitinfocharts, I use it as well but some numbers looks outdated.
Another great source of info is coinmetrics.io
The key to me is that it keeps moving in that direction. It might take another 5 years before we see a major shift to a level where it can be said that the distribution is "decentralized" to a degree that most are happy with.
Over time, I watched more accounts achieve power. The number of accounts getting their first and 10th SP consistently grew. That was going to be the foundation for the future.
We will have to see how things evolved on Hive.
3% :)
Just funky math ... will look in closer at some point.
Have you seen this report?
https://steemit.com/steemit/@bitgeek/payout-stats-report-for-2nd-november-2017--part-i
I've been trying to get it reproduced since that guy stopped.