All I can say is this:
That performance by MP/JR, EG, and the bass player sounded more like Dream Theater then Dream Theater has. There is just so much more energy in a show that is not played to a click. You CAN tell, and that's not a damning of Mangini or DT. It just is what it is. This one 12-minute performance is the Dream Theater I remember. There's an energy, a connection, between Portnoy and Jordan.
I sincerely hope, after the DT tour cycle for the new album is done, MP, JR, and JP reunite Liquid Tension Experiment (with TL, or whoever else if he is not up for it), and commit to not only playing LTE songs, but being willing to do some DT instrumentals.