Calling Luffy and the others (the whole Alliance) clearly tells us Yamato already had figured the high level of threat Greenbull represented.
Momonosuke was simply trying to do things by himself without being carried by Yamato and Luffy 100% of the time, who carried his ass throught the entire arc basically.
Not surprisingly Yamato spent most of her time helping Momo during the raid
Thats Yamato after holding back Kaido for more than 30 mins by the way