Because of the restructuring of the show from the technical problems, the lotuses get introduced too early. The original idea was that they start coming in as the animal spirits leave their barges at the end of the "Animal Spirit Parade" segment, hence why you see lotus imagery go over the water screen as each spirit ascends. If they were able to fix the problem with the little lanterns or perhaps, rework the concept behind them in some way like making them more like little rafts with fountain elements for the parade sequence, the act structure could be a lot clearer.
And they do need something more impressive then the tower. I'm very much in the "Put a dragon in there" camp to give the constellation finale a Draco/Seiryu figure.