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Can't he just set the 580EX as a slave (programmed manually) and it will activate off of the light from the 580EXII flash? I have 2 580EX2s and 1 580EX. I have done this...
But you had the "Master" Speedlite in the camera's hot shoe, didn't you? The Master receives data from the camera via the ETTL communication pins, even in Manual mode, not just a simple sync through the center pin. The Master then sends multiple command and control pulses to the slave(s), not just s simple flash pulse, to trigger the slaves, even in Manual mode. In this case, the OP is using the Speedlites triggered by Pocket Wizards, which do not have these command and control connections, so no, it won't work.
BTW, I don't know why you haven't been able to get your 580EX to work in wireless ETTL mode; I use a multiple-Speedlite setup all the time, and can use Manual or ETTL as I wish. It's a creative choice, not a technical one.