...Simon was, quite literally, in his human body when he fought. against AS in, you guessed it, a humanoid body. there was nothing godly about that fight. that was the entire point towards that dramatic finish - they left all the god stuff already and were just gonna punch each other a lot.
the only rule he had against earth was that they didn't breed until X number. there's a reason Genome managed to make a bunch of mechs, an escape plan, etc. yes, that is stupidity. leaving enemies that waged war on you to live - not because you're a good guy who shows mercy (which is dumb but at least an semi-understandable trait) - but because you felt like it is dumb. his 'contingency plans' were beaten down by brute force, which is the only thing he ever showed to be good at. damn well wasn't his brain that was ever good.
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The future must protect the clone's past.
"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.