If DEV had so many coins it would had been dumped already.
Dev not so stupid to dump it all at same time. Coz walls not selling quick. He selling little amount and waiting for higher price.
You are pretty wrong. Everyone had the same chances as dev to mine a lot of coins. I got a lot of them, but I mined from start + monitored wallet state (block number must be the same on all wallets when you check information tab) on all computers all the time and restarted when it went on the wrong chain.
I'm not saying that someone isn't have some thousands. But how many blocks already? How did you know how many coins DEV has? I think he prepared for solo very good.
1. Add "slow" node at start
2. Turn on you miners solo
3. Multiple nicknames says "I got some coins" in thread when others can't sync fast without nodes except DEV.
4.

5. PROFIT!
You can belive whatever you want to. And call me stupid or naive. But I'm sure, DEV specially makes diff so low for so long time.