Beagle
I think that the EWO does have an attitude indicator (from memory), as well as altimiter, ASI and HSI. In any case, you should know from your own experience that the entire crew is involved in the pre-flight brief, not just the blokes sitting with the stick and thottles.
Tarnished
Perhaps the training benefit came from the fact that there were a couple of life saving instances of unusual attitude AAR conducted by SAC tankers during SEA? Perhaps those that were expected to teach the theory to studs were expected to have accomplished such manouvers in real life?