We know that about 10% of all coins are generally traded on the exchanges. So if you take 10% of that 10% that are not in control you are left with only 1% of all coins up for sale.
I don't think this is correct, man.
Please bear in mind that for most coins, only a fraction is mined during the early days - and there have been several monumentally massive first-week/month dumping that far, far exceed the 10% mark.
Unless coins have PoS or stellar innovation/development, exchanges are typically flooded from the get go. Even some of the relatively stronger coins suffer from cyclic dumping in an effort to strategically depress prices.