Thanks for the lesson (didn't really need it), but I think you misunderstood. A cylindrical fuselage structure - as in the 757 and 777 - will be more easily bent, in a good way (one that dissipates energy) on landing. Any shape that is not precisely cylindrical will be much stiffer to bending moments as a whole structure. That means the energy will be internally absorbed into the structure as heat and lattice dislocations in the metal structure of the fuselage. That is what leads to cracks.
Now, I'm getting up in age, but I can still tell a cylinder from a football.