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?
Yeah, I think you're right, I suspect that this is a big private sale. Someone wants to lock in some profilt on a scale the exchanges can't handle. I'm sure they'll still have most of their coins, and they'll have a private island too!