Applied to the Scott Movies

I found the black goo popping out of them very interesting.  This goes back to the fact that there are many "different" strains of the goo-

I accept the explanations shared by the source article, so I think that clusters of parasites are leaving the Engineer bodies in the movie stills - not black goo. Ok, they look similar but they are different.

i still support the one goo theory.

Where one goo / pathogen exists and has various outcomes depending on host type (an Engineer and human may reract differently under the same comditions) -  amount of goo - ingested area 

However,only the one pathogen with the strength to wipe out all non botanical life on a planet if sufficient amount of the patgogen is dropped into the mix

sherris - Yes, the quantity is an important factor here. According to the source, Holloway and Fifield suffer the same mutation, but Holloway consumes only one drop, so he mutates very slowly.

Ati, this analysis of the spider cluster release and the monster cluster bursting out is wonderful. I can't wait for the prequel novelization to come out this month.

Ingeniero - Thanks, these are just shapes, of course.

Just a little correction, I think its all spot on, but I think in Holloways case specifically, the black goo infected his........em......juices......which then took a detour into shaws uterus and got some mutating from the uterus. David used a similar process using shaws reproduction system, but instead of a trilobite and shaws uterus, he made it more efficient, making eggs and facehuggers.

A L I E N 4 2 6 - Yes, the Holloway process seems to be a special one, he is mutating at the same time...

Anything is possible, however, I think it shouldn't be over-explained and classified as an exception.