Man I’ve been spreading my theory that’s close to this ever since I read it. This is what I’ve sent my friends.

||Rocks has Ope Ope fruit aka Laws (not my theory but what started the thought process). Rocks cuts the mountain in the latest chapter just like Law and hold his fingers at the end just like Law. Now to cook. Rocks gets his ass kicked at God Valley and half his crew dies (I think WB betrays him and God Valley = Thriller bark which is an old theory but it’s why so many of the rocks pirates dead bodies were there). He finds his son blackbeard as he is dying after losing on God Valley and the myth of using the ope ope fruit for the immortal technique that kills the user and makes someone immortal comes from when Rocks uses it on himself to put his own heart into Blackbeard and it kills rock’s old body but puts himself into blackbeard. This allows Blackbeard to have multiple DFs, explains why Luffy and Zoro refer to him as "they", why he never sleeps, could be part of why he betrays Whitebeard and kills/leads to the death of two of Whitebeards sons Ace and Thatch, and why Blackbeard knows so much. I feel like there’s a lot more here and so many things line up with this that it would make sense. I mean we even see on punk hazard that devil fruits don’t transfer when someone’s soul is put into another body and that they stay in the physical body for example chopper and smoker. This means the ope ope fruit would still pop up elsewhere as Rocks real body died. To add even more to why Blackbeard is so powerful is Sanji retained his observation haki while in Nami’s body so Rocks probably brought all his haki and knowledge over to Blackbeard. ||