Possession is not ownership. The major exchanges hold a lot of coins but those coins (legally) belong to the depositors. This can't be reflected by looking at the address distribution. Using the graph you used to illustrate a point would be like graphing where all the US dollars are and showing that 5 "people" (BofA, Citibank) have 90% of the dollars.
The truth for fiat is that around 35% of the top 1% own all the money. 70% for the top 10%. (In the USA). Regardless of the exchanges its clear to see that distribution is actually worse for BTC. Has anyone actually read my first post or have they just read wealth distribution and already made their minds up?