Why would Billy's father leave the company to Eric at all?
It seems odd that he would ever make that choice, seeing as Carl was more than qualified and not a total dick. Why choose Eric at all?
And why not give Billy an education in running the company rather than have him go through school again? I think it would be more practical for his dad to have paid experts to teach him how to run a business rather than have him go through school again. I didn't learn much about running a company in my education...