Good sponsor is mirror of your good work. Due to him you earn your income, your status and he refers you to good source of information. If sponsor or co-sponsor are not well informed, not interested enough in doing his job you are going to be lost and you'll consider of quitting the job. He must lead you through every step and way of improvement your job. He must be online as much as he can so he can follow your work. Otherwise, he will harm both for you and his reputation.