Bumi then notices that their group is missing someone, and says "Someone's missing.... where's Momo?" Sokka answers he is gone and that he is with Aang. Bumi says, without a single worry, that it is okay because they have each other.
After that, I expected him to play a part in the outcome, but I didn't noticed any action of Momo that made his presence critical. did I miss something or it was just crazy talk from the old men?