Yes; to be frank, it will be a "fucking blood bath". Whales supporting their own chain will be dumping the other chain to the ground in hopes that their chain is significantly stronger than the opposition.
Interesting thought. I suppose since Satoshi may still be out there holding a huge amount of coins if they're unhappy with one particular fork they could probably pummel it into oblivion by dumping those coins in large amounts day after day.
Yes, this is what I have mentioned in the other thread. If Satoshi is adamantly against BU (and there are reasons to think he is) he could dump it into the ground. It would be a very dangerous move though. He would be acknowledging he is still alive and has active control of his keys. He might help core by dumping on BU, but it could also make people not want to use either chain knowing he is back. Obviously very unlikely but interesting to think about. Of course, as has been mentioned, it will be a dumpwar fest regardless, since there are plenty of massive early adopter holders on both sides of the debate.