The exact number can only be guessed. But it is at around 700k BTC.
Looking at the earliest blocks, you can see some correlation between the hashrate and other factors which can lead to a conclusion that the majority of these blocks have very likely been mined by satoshi.
Who would do this and trust bitcoin so far? Logically this person can only be Satoshi.
That statement is far away from being logic..
Because coins havn't been moved, they have to belong to satoshi ?
What if those private keys got lost ? Or the owner died ? How can you be so naive to say it is 'logic' that they belong to satoshi ?