If both creatures are put in they could very well be part of the same species. The reason they look different would probably be due to sexual dimorphism.
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You make a good point there but if i saw something larger than the Sea Emperor coming out from a dark abyss from the front vindue in my cyclops then i would be legitimately affraid or amazed depending on its behaviour.
So far the survivor is the only human on the planet. I would probaly go insane if it were me. What if the suit computer or whatever the thing that warns us about our oxygen levels and etc. assisinged tasks to the survivor to keep his mind. It suit c…