He got multiple hundreds of thousands on day one, that much is obvious. In addition, he compounded those gains by running masternodes when the return was around 20% per year. I would be very surprised if Evan did not have over 1 million Dash.
A simple compound-interest calculation puts it close to 50%. Start with 100% of the stash when there were 2 million coins (the premine). Then apply the 45% interest on the mining and re-capitalize it until you reach 7 million coins or so.