The votes here are not stake-weighted. All council members have precisely one vote. So a council member with 5*T_council and another council member with 1.1*T_council MarketTokens have the same voting power.
This allows for a sybil style attack where a council member with 5.5*T_council tokens distributes them to 5 separate addresses each with 1.1*T_council tokens and gains 5 votes in the council.
Slightly out of date, since the current vote staking mechanism just allows this council member to vote 5 times directly. This is documented in the book already, so closing for cleanup.
From the protocol:
This allows for a sybil style attack where a council member with
5.5*T_council
tokens distributes them to 5 separate addresses each with1.1*T_council
tokens and gains 5 votes in the council.