I have two skimmers and the main drain with 3 - 2" lines going back to the pad which is @ 25' from the pool. There is a single 2.5" return line. Each line has a neverlube valve on it at the pad

There is no extra plumbing to divert the water to drain the pool via the main drain. Wouldn't there have to be a diversion valve to send the water somewhere other than back to the pool?