The shape of the Viking & Curiosity entry configurations has everything to do with aerodynamics and nothing to do with anything allegedly learned from any alien spacecraft allegedly recovered at Roswell.
Presumably any alien-originated UFO would need to have the same type of aerodynamics to permeate our atmosphere as well, wouldn’t it?
I was just saying that it was interesting... Heck, it wouldn’t surprise me if the Roswell crash was some kind of a military test craft if the truth was ever really known.