answer this question honestly, drop the bullcrap for 10 seconds:
Q: if you were given the option of (A) having $200m with probablty 100% or (B) having $1bn with probabilty 20%. Which wuld you choose?
You will never be given either of this options. If you had such an option, you'd blew it when it was (C) 1$. So not applicable, it is not some scared kid moving these coins.
He'd sell 28k coins for 20mil, good for just about anything in this world, if he would suddenly feel so itchy. Not much reason to move all, and definitely no reason to sell all. You don't amass significant portion of BTC economy by being stupid. There's something else going on.