Also I read today that John has been caught turning the mining off and on, thus the test net is not a unprotected P2P network where the adversary can apply all his potential powers.
That was the live network, people agreed on it, it was needed for testing purposes. TestNet is untouched since deployed. Either read over stuff properly or don't comment on them at all.
All we asked was for him to explain how he would handle Sybil and DoS attacks
You would probably know by now that John isn't here to answer the question. Jump on IRC (#vanillacoin) or send him a message through BM.