So, the point up to here is that Case and Theta seem to overlap quite a bit. As for the two distractors offered in class: ECM and Passive, I think they're trivial. For one, the passive is a marked form. In English, there's something about the
As an endnote to all of this, I just discussed these views with a fellow linguist trained in the Generative tradition who also happens to have a PhD in theoretical syntax, and he agrees with the above argument. Why not send him back to Ling-610?