edit: only POW provably solves the byzantine generals problem in the face of sybil attack
Delegated proof of work, which Bitcoin is, doesn't. If 70% of the hash rate is in china owned by three pools, you have no way of knowing these pools aren't owned by the same person (sybil). The only way is to audit them yourself, which is the purpose of the voting mechanism in DPoS, to audit the block validators for sybil. The only difference is, the audit mechanism is built into the protocol of DPoS and excluded entirely from DPoW (delegated proof of work).
Seriously, read my first and second post in this thread, I'm not bullshitting here, it's painfully obvious this is the case:
The Bitcoin consensus mechanism is incorrectly labeled Proof of Workhttps://bitcointalk.org/index.php?topic=1176835.0