SPOILER: Worms/Cobra's = Human/Mutants = Shaw/ Squid Face Hugger Monster?

I haven't seen the movie but I have read nearly every spoiler and seen all the pics. So my question is this... Does the black goo simply create a killer species based loosely on what it touches? If the goo mutated the worms to space Cobras or caused one to birth a space cobra that impregnates the human and causes another evil snake creature to burst out THEN... that mirrors exactly what happened to Shaw except her derived facehugger got itself into an Engineer. The new xeno is smooth and fleshy like humans but bursts out massive due to gestating in the engineer. So lets say the goo infected sharks. A crazy ass face hugger would be born that would impregnate shark shaped monsters into whatever it found to host with. So the resulting burster would be some psycho evil looking fish no matter if it used a human or fish as a host. This is opposed to a classic ALIEN facehugger latching onto a shark and producing classic looking Xeno's with shark like features. Like how the ALIEN 3 Xeno still looked like the Classic style but it was just shaped a little different. It wasn't a drastically different creature. I think this must be the case. If it is and the Engineers really are not bio-mechanical but instead larger version of us then I would imagine the results of Humans and Engineers being exposed to black goo would result in nearly identical Xeno species. The classic style Xeno from ALIEN looks like the SJ suit. So my only reasoning would be that they didn't originate from the SJ(meaning a SJ didn't spawn the face hugger creature) but something else that has a exo skeleton look. Or perhaps the Chest burster somehow was able to adapt elements of the SJ's suit since it is bio-mechanical. Thoughts?!