What makes you think there's only one solo miner? Seems to me there are several . .
These addresses come from the same wallet (XpoolX):
RFqKLWLtxR5K6i4VsR8vDHsusvuF3Csg1E
R9KQKgP1YckHoGJuyjHNuwGijQ9Pev1ryc
RR1eWm6tPdD6fEXtkZYEivGihSL6WwU8CH
The first one have a 5% fee to the third address, which also Solo mine with 0% fee.
Blocks resolved by these 3 addresses range from 50% to 70% of entire network.
Also "All others" addresses periodically send coins to another 4-5 deposit addresses.
All these coins (about 75-80%

) are conveyed in 3 final addresses (2 Poloniex and 1 BTC38) by the same person!
You have the necessary considerations......