I explained bitcoin to my relative and she asked: what if the boss behind bitcoin ran away..........................
If it had happened, maybe it would've happened in 2013 when the price went over $1200 or even before. At this moment, he would have over $18 billions and.. I think it would be enough, wouldn't it? Just saying.. plus that Bitcoin's fall would probay make all the cryptocurrencies existing fall too, like a domino, and as soon as he would close Bitcoin and run away with all the money nobody will exchange it into fiat anymore, so it'd become worthless.
Regarding her statement, the irony lies in the fact that there is no boss controlling Bitcoin, there are large holders, and it is possible that Satoshi is the greatest of them. But it's like you said, if his intention was to dump the coins, he would have done it in 2013. And if he decides to do that in the future, it's his coins, so he has the right to do that.
The first reaction of the market would surely be panic, but after that what we would have would be a greater distribution.