Earlier quoted context omitted.
> and one would need more than half of that total stake to have a chance at attacking the network Actually 1/3rd to disrupt consensus, and 2/3rds + 1 to take control of the chain like you could with a 51% attack on a PoW chain, only you'd get almost immediate and complete control over the consensus.
The strength required to take control is probably 1/3 as it is with most Byzantine setups. (The 1/3 control attack against Bitcoin is selfish mining.)
You can't control the network with 1/3 with BFT consensus, you need 2/3rds.