. . .He knew the block reward would half every 4 years, and though he would take advantage of this opportunity to come and sell off and dump half of his bitcoins every time it does. . .Watch out guys, the markets would be annihilated if this is true!
Markets annihilated? ... Is Satoshi really that dumb?
Seriously, what would happen? Satoshi puts sell orders in the sum of BTC700K on all the exchanges. Price would go down to essentially nothing. Those who say WTF, buy them all. Price would bounce back. Within minutes.
So Satoshi needs to be dumb enough to do this, but smart enough to know when the drop in block reward is priced in.