Something very important that the article is missing is the role that grain buyers play in the grain sector.
Grain buyers are the mediators between farmers and the market (industry, consumers, exports, etc...), they buy and resell your grain. They have also grown to be also the providers of inputs (seed, fertilizer, chemicals, etc...) + credit and thus insurance (they are heavily involved in the finance sector).
They hold all the power in the farming sector, if something fishy is going on you can bet they are involved, if not directly responsible.