Either the other survivors are dumb or jerks to Riley

When on the surface of the water on the planet or on the Floating island you could see Lifepod 5 floating in the distance, the only lifepod afloat. From listening to the audio logs about say 4 maybe 5 survivors went out and explored/swam to the rendezvous, Yu and Keen made it to the island. But none of them saw our Lifepod, to take a moment to look and be like "Hey there's another lifepod lets check it out for survivor's", instead they just go straight into a reaper's jaws. This was within a 3 hour timespan of Riley knocked out. A part of me thinks there was one survivor who saw him and were like "Oh it just Riley, he won't help me" and swam to their demise. Even if by some chance they saw his pod no one came knocking or helping him. Makes me fell like these survivor's are dumb or jerk to our protagonist.