

Remember that the Red Marker was a manmade construct. And it wasn't produced by the other Moons. They said that it was controlling the Necromorphs, but later we find out that the Moons are actually the ones controlling them. The final boss of DS1 always bugged me because it seemed like it got retconned pretty obviously.
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If this is true it means that the Creeper is the only existing one of its kind, that being the reason one was never seen in anything but the book.Something just dawned on me in regards to Dead Space lore. This would allow for the escape of the genetically-engineered tissue, and the chemical assistance it received could account for its rampant growth and acidic properties. Being that Guthe injected himself with the virus and started the outbreak, he never closed the incubator where he was experimenting on one of the specimens. In his experiment, he synthesized the Necromorph DNA into sheep cells, then chemically stimulated them to grow. One possibility for the creation of the Creeper is that it was a by-product of Doctor Guthe's experiment before the outbreak.

It is possible that the Corruption and the Creeper are the same thing, but the Creeper is the earlier form of the Corruption when it is aggressive and must obtain bodies in order to make Guardians.
