Seven people hold 90% of coins. They have received the coins almost for free. What is going to happen when one of them dump his / her stake ? They were for free. Price doesn't matter.
You are wrong, they are not seven. 90% of coins belong to a single entity. He/she/it just spreads those coins over many different accounts.
To be seriuos, if you mean: there were only 7 initial stakeholders, you are wrong, they were 73.