I'm new to forex, but not new to business. I'd say that considering the circumstances of the three employees moving away from YTFX, and joining the other company, that you're in for the battle of a lifetime trying to get your money. I've read all the posts, and this definitely sounds like fraud to me. A company offering a managed account by their own employees just seems fishy.
I'd look into the legality of their action according to local laws wherever their office is located, and file charges showing the evidence you have to prove the deposit and the growth of the account, and their emails. Perhaps the local law enforcement can do something about it.