You won't be able to cover for your colleagues at the beginning of April. It's important to ensure that everyone has received the proper training. If this doesn't happen, important work will fall through the cracks. Talk with your superiors if you feel the team isn't capable of operating on its own. A mature handling of this situation could result in a promotion near April 18. A new position could be created for you, or a powerful individual may suddenly leave the company. Once you're given the reins of power you'll be able to make changes that radically increase productivity.