It also means that the opposite of that is nightmarish for parents to try to fight against, when for example the rest of the IEP team is stacked with yes-men/-women who nod at the ringleader (your nemesis) and look at you as though you're crazy for being "that parent" when the rest of them all see NOOOOOO problems.
This has been our experience, but it can backfire on the team if the ringleader doesn't give the orders out soon enough, like before teachers fill out inventories which indicate their concerns. It is very disconcerting/frustrating when teachers admit to concerns X,Y, and Z (or they were the ones that brought things up in the first place!) and then totally turn on you (actually, the child) at a meeting, clearly taking orders. Their jobs and professional relationships are more important to them than any particular kid/family.