I really hope, we get a little flashback to what Sanji and co were doing in that time.
Could be. Also, I really don't know what to make of all the information regarding him. Beaten 7 times? When? And by whom?
There's just so much to speculate in this chapter, I love it.
Well, we know Shanks beat him once when he tried to jump Whitebeard before the war. I imagine Whitebeard himself dealt him one of those defeats, Big Mom as well since the 4 emperors seemed to be in a sort of stalemate power-wise before Whitebeard died. That's one we know for sure and two we can guess at with decent certainty.