I just had CQ on different equipment but the FO was the pilot flying for the LOE. Depending on the abnormal the FO will likely end up flying anyway so it really doesn't matter. My advice is to obviously use the DIG to guide your prep. The first day will be very busy but there is usually a good mix of reviewing stuff you already know and seeing a few new things the training center is trying to make us aware of. I generally get a lot out of it. The LOE is pretty much exactly the same as the event you had previously. Some guys like to dig around and find out the scenarios ahead of time. Personally I think I perform better when I allow the LOE to unfold as it is meant to without knowing what might happen ahead of time. Even when you do know the scenarios it rarely plays out like you imagine and IMO hurts more than it helps. YMMV.