My point was: Once a person has finished buying 10% of all bitcoins, they'd be in the same position as satoshi is now. The attack by a dollar-Billionaire would involve buying today and crashing at some indeterminant future date.
If we're worried about satoshi for his savings, we should also be worried about the potential Hunt Brothers of Bitcoin; wealthy individuals that are considering an attempt to corner the bitcoin market anonymously. I don't see how satoshi could possibly have designed Bitcoin to prevent this scenario without sacrificing a lot of what makes Bitcoin great.
We don't know Satoshi. We don't know his/her/they real long term plan. We don't know for sure why bitcoin was created. It would be very easy for Satoshi to cash out.
This is a fair point. The better we understand the intentions of the larger holders, the less risk there is to holding Bitcoin. In this sense, knowing who Satoshi is and what he intends to do would be beneficial. However, any cryptocurrency which indirectly required all large holders to be well-studied public figures would be inferior to Bitcoin on a far more fundamental level.
Note: I'm not accusing you of such a claim. My primary criticism of jabo38's post was in the summary:
I certainly agree that satoshi not having all this power would reduce risk for bitcoin holders. However, this is very much not a flaw in the creation of Bitcoin. Indeed, the freedom to privately acquire and hold 10% of all bitcoins is a design feature*!
*At least: a simple and natural consequence of intentional design features.