What strange curving? It's a large section of skin & L3 door from the left mid-section just over the wing that's been torn from the structure just as the rest of the fuselage aft of the wings has been. The structure on the right is the aft section of the left-wing fairing.
Regarding "absence of evidence" & "evidence of absence", the Egyptians obviously need to fill in the gaping absence of explanations if the bomb theory is toast.
Similarly, I know the MAK is good, but the Russians need to provide the same quality of evidence for their bomb theory.
Either explanation needs to withstand independent scrutiny by people and organizations who do this kind of investigation work in their sleep.
Until then, all explanations are sadly just political posturing no matter what is said.