It is very difficult to make assumptions regarding the data extracted from the wallets. Most of the individuals may be having more than one wallet (I myself have dozens of BTC wallets). Also, some of these wallets may belong to gambling sites, exchanges.etc. I would say that the only reliable information regarding Bitcoin ownership comes from the leaked Mt Gox data. Mt Gox had made KYC mandatory, so we can assume that the data is having a high level of accuracy. BTW, an user of this forum (rpietila) posted some stats a few years back. You can check them here:
https://bitcointalk.org/index.php?topic=316297.0That is something I am thinking as well, even though the statistics were right of the number of wallets that own 1 Bitcoin and more, there is a sure thing that 1 person owned multiple Bitcoin addresses from it, this is for security and personal reasons as well so we can not dig up why they had such enormous number of Bitcoin I also had other 2 Bitcoin Adress but I am currently sticking to one because I don't really have the number of Bitcoin to circulate it in multiple addresses,
Furthermore, this kind of thing is pretty normal back in the days when people are just mining and earning with faucets, and a lot of people that keep forgetting their wallet passphrase or password, but I don't know if multiplying your Bitcoin to a number of wallets can make an impact with its price.