"Yamato tells Momonosuke they should ask Luffy and the rest for help, since they won't lose against a guy like this."
First "They" = Yamato, Momo and Co, should ask for Luffy and the SHs help. Implying they as a group need help against Aramaki.
Second "They" = Since the SHs wont lose the same way they lost.
-----
Its also interesting how she tells Momo to call Luffy and the rest of the allaince. Implying she doesnt think Luffy is enough for him.