I know he isn't a reliable source, but I can see them using this down time to work Jungle Book in. Since the show relies on projection I can see a portion switch to have the "tiger" float come out and then Bagheera talks about the jungle the elephants creating the jungle, cue the elephant float. Then a talk about the red flower (one of the flower floats with red lighting) for a nice Smokey bear touch. I don't think this is the reason for the delay tho.
From what we've seen there are 2 storyteller boats, 4 animal floats, 1 main flower and 4 smaller flowers and I haven't seen them in the love pictures yet but also possibly many smaller lanterns. I can see control issues popping up but I wonder if they contracted out the control system or attempted it in house.
As for a barge sinking, I don't see that happening. Proper design should prevent, even on the flowers which pump water through them, they should have multiple ballast tanks so even if a leak develops in a few it would stay afloat and just list.