On another forum I'm on, we had a interesting "conversation" about that. (We also have some people that live nearby trying to get ahold of some.) The debate was if/when the hybrid was formed, how long ago it was vs. how many of each species mated. We never did find a answer, however it is clear that there was a hybrid and it was more on the roach side then the cricket side. Most likely, you would need to go way back when they were closely related.
Who knows, there was a cross between Pallida and Lobster Roaches reported there! The babies are different looking then either species, can climb, breed more quickly then lobsters! He has yet to post pics, yet, so who knows? Anything can happen!