Also Monero is not that decentrilized when it comes to the owners. Probably Risto, Warz and a few whales control so high portion of the coin supply that they can wipe everybody out if they so want by dumping Monero literally to the lowest sections of Orwellian hell.
So, the situation is fundamentally the same: In Monero the large owners are whales, in Darkcoin the large owners are the masternodes.
Talking this is total speculation since is impossible to know any holdings. I personally think and speculate none of those 2 gentlemens is one of top5 Monero holders. Maybe are not even in top10.
You cant compare decentralization of DASH and Monero owners. I am pretty sure about this, since Evan and co mined 25% of DASH in first half day. I am sure they have way more then just that since they mined more then only half day. It is pretty stupid to compare them since Monero is probably one of most decentralized currency in existence.