doesnt matter what satoshi does. spending coins is just temporary "price" drama.
if anyone only cares about price drama they need to take a step back and think about the bigger picture.
if anyone only cares about 'double my coins' greed drama they need to take a step back and think about the bigger picture.
Dumping almost 1 million Bitcoin is "temporary price drama"?

I dunno.. 5-10% of outstanding btc might not be "temporary price drama".
10min-2 hours minutes of pressing send and waiting for funds to confirm into an exchange
placing an order and selling the coins.
once sold, then what..
oh yea over a century of blocks still producing.
a few hours of price drama maybe even a few weeks.. compared to a century of block creation = temporary price drama
much like ethereum.. the price drama of their bilateral split is over. people dont think its exciting and just treat it as 2 alts. much like non-exciting trading between say bitcoin and litecoin.. no drama the litecoin/bitcoin drama ended in mid 2012... just a couple months after litecoin got popular then slowed down..
My point was regarding the special case where a single individual who might not like one of the resulting chains controls a huge percentage, at least 5% of outstanding coins. Is there anyone like that in eth? Maybe the DAO hacker if they hadn't forked... I think that was several percent of all eth. And, in fact, maybe someone else did control that much eth, and maybe that's why etc is at least an order of magnitude cheaper.
If for example Satoshi dumped a billion dollars on BU, he could take those profits and buy core BTC, and make it more profitable for miners to mine core. Obviously this is all unlikely, but if it did happen it would have lasting impact imo. He wouldn't even have to sell them necessarily, he could just move them to exchanges and say if you want the price of BU btc higher than X you better be prepared to buy $1 billion dollars of my BU btc.