User blog comment:12th Supernova/Chapter 824: You're playing with the big boys now/@comment-3529684-20160421152924/@comment-24850639-20160421183907

The same reason Law won't betray Luffy. You don't turn your back on someone who does you a solid that big, and expects nothing in return. Pekoms was a Mink before he was a Big Mom Pirate, and him wanting the best for the people of homeland isn't something that should be held against him. As his captain, that's something you're supposed to understand, and sympathize with. Pekoms is getting a first hand demonstration of the difference between what kind of captain Big Mom is, and what kind of captain Luffy is, and he'll see who it makes more sense to follow in light of what's going on. Doesn't mean he'll join, but I def see this as the end of his allegiance to her, based on what Tamago said about the whole situation.