Ultra vires and constitutional identity control – apples and oranges or two drops of water?

The PSPP decision raised the question of how to deal with competence and jurisdictional conflicts in the EU. Once suggestion is to install a Mixed Appeal Chamber of the CJEU. Apart from ultra vires control, the New Chamber could also engage in constitutional identity review of EU law. In order to do that I will propose, what I call, the “sequential” model of adjudication on Art. 4(2) TEU, which in my opinion can be applied in the current legal setting, but which could be potentially complemented with the establishment of the new chamber.