Spoilers are possible if you haven't at least reached Skypeia. Well, this passed through my mind not too long ago, and I wondered what the rest of you think. I think there's is a slim possibility that Blackbeard did not kill one of his own crewmates by his own will, but was forced to instead. I get this reasoing after seeing a symbol on Whitebeards medicine. There is a symbol of Bellamy's crew. As every knows, Bellamy isn't the true Captain, but Doflamingo is instead ( before he became Shichibukai, that is ). Because Doflamingo's Crew Symbol is on Whitebeards medicine, it leads me to believe that Doflamingo was once on Whitbeards crew as commander ( exactly like Ace is a commander of Whitebeards crew ). So, what does Doflamingo once being on Whitebeards crew have anything to do with Blackbeard killing on of his own crewmates? This: Blackbeard is also on Whitebeards crew, and I wouldn't doubt that Doflimingo probably knew this. My theory is that Doflamingo used his ability ( which seems to be controlling people ) and made Blackbeard kill someone. Why? Either Doflamingo want's to try and dispatch Whitebeards crew because he knows how powerful it is, or becuase that person Blackbeard killed was an enemy to Doflamingo. But why hasn't Blackbeard spoke up for himself and told on Doflamingo? This is how I see it. After he left the crew, he realized he can be just as strong as anyone else, so he started his own pirate crew. But it could be deeper than that. We all know Blackbeard is trying to gain Shichibukai level. Why? Well, the obvious reason for most pirates wanting to get to this level is becuase that basically means free pirating. But I think Blackbeard wants to do something different. Blackbeard wants to get to Shichibukai level so he can be sure to meet face to face with Doflamingo again, the man who made him kill one of his own. Anyway, I just decided to spread this theory of mine. What do you all think?