From what I hear there was a line in question in the last version which allowed trusted nodes to send sc to the CPF (PUBLIC WALLET FUND FOR SC) ("if( x < y)" where it should have been a "if(x != y)").  This only allowed trusted nodes to send money to the CPF, but the CPF account is public and if any foul play was detected everyone would know instantly. Since then the trusted nodes have been patched with the latest version, and they are preparing it for public release soon. That is one of the advantages of having everything open source (which I always advocated for), problems like this become detected and get solved.

To "take over the network" you need both a trusted node with more money than any of the other trusted nodes on the network and 51% of the network hash power. I don't know where you are getting at with 51% of control money gets you the network? You need money + hashpower to even think of a successful attack on SC. The devs have told me that in the future they are planning to change that so that it would effectively need two trusted nodes, eventually leading to a system where  you need a majority of trusted nodes (voting system). Just so we are clear, in the "Every other" scheme, a trusted node cannot sign two trust blocks in a row. This would require an attacker to have two trusted nodes whose total balance between the two was higher than the good trusted nodes who signed the blocks.