Yes, on certain OW dives certified assistants are allowed to lead tours at a ratio of two divers per certified assistant (not the same ratio of the class).
On OW dive 1 it is not 'required' for students to have buoyancy control BUT if you read the goals and the recommended techniques for the dive both address the need for the student to use buoyancy control. A good instructor would see that his/her students were off the bottom.
Granted not everything is 'in bold' and not all instructors teach to the minimum standards. Like everythink in life, you have people that will try and get by with doing the minimums, SCUBA unfortunately is no different.
On OW dive 1 it is not 'required' for students to have buoyancy control BUT if you read the goals and the recommended techniques for the dive both address the need for the student to use buoyancy control. A good instructor would see that his/her students were off the bottom.
Granted not everything is 'in bold' and not all instructors teach to the minimum standards. Like everythink in life, you have people that will try and get by with doing the minimums, SCUBA unfortunately is no different.