User blog comment:Kaido King of the Beasts/Chapter 857: The Art of the Deal/@comment-24850639-20170302134046/@comment-24769684-20170302135229

Considering the lengths Bege went to to get Sanji, I can see why Big Mom would trust him. Bege's strengths while subservient to Big Mom seem to be clear to the rest of the crew given how Jinbe described him.