No,,because Encore! is side story of our favorite character..
Kutau story is the first story at Encore! , but that doesn't mean Encore! is all Kukai and Utau..^^
I don't think so. As much as I love Kutau. We need to know who Amu chooses. I believe what Peach*Pit is trying to do is, to get all of the other couple possibilities situated and taken care of, to get to the big TadAmuTo decision with no worries. Of course I could be wrong, I've been known to have almost incorrect predictions!