IIRC Vitalik has backed away from these proposals because they do not provide the security benefits he originally thought they did.
Thanks for the information. The post I linked is from this month so what you are discussing must be fairly recent. Do you know where i can look to find him backing away from PoS so I can review those arguments?
As far as I'm aware he is favorable to Slasher ghost but doesn't want to trust untested algos on Ethereum and is opting to roll in PoS later on(how will be interesting)