I think you need to look at the mole under the lips. Thé actual top got it to his left side, but the other one (his big brother) got it on his right side. So thé actual top is the young boy with black hair and mole on left side under lips. and so I think that its really his "big brother" who died.
So who did the bottom know from before? Evil bro who died or the actual current top?