In fact, that point I mentioned right in the OP, which you included in your quote, by the way. I highlighted that we are not invulnerable or immune to the impact that a big whale could easily deliver. But then the price would plunge however low, even to single digits if, for example, Satoshi himself comes out of his hideout and drops his stash of coins on our heads. But there are more than enough bearwhales beside him who can dump the price below what we could reasonably think of.
The Mt gox coins were never written off but the Satoshi coins after this period of time are considered out of circulation permanently. So any return of the OG would be both surprising, no doubt welcomed but very much introduce a giant source of coins back into the market which would not be bullish.
The effect of the Mt gox coins is like water into sand, it brings liquidity and higher supply then normal leading to a lower price for that length of selling. Its not changing the underlying value but buyers are more able to find supply. The real weakness at present I think originates with the end of the tax year. That event unites sellers into a specific program of selling not normally present in the market, its especially able to lower the price at that time.
Again its not altering the worth only the market availability and price for this time. I think this is a natural process, we are all familar with profit taking even within a bullish trend this occurs as traders naturally hold more for short periods of time then they can own longer term.