When the cannibals are shown getting ready to attack the shuttle, they are on 3 sides of it. Yet seconds later they are all attacking from basically one direction, as Isaac and the kid are firing in the same direction.
When Ty falls into the stream is he drenched from head to toe. When Marcus helps him stand up, you can see that Ty's turtleneck is only partially wet.
Isaac tells Claire that, even if the Orville did receive their brief distress call, it could take them weeks to arrive if traveling via normal space (he was, at that point, unaware that the Orville had followed their path through the rift and was already in the same star system). It was established in Pria (2017) that the Orville's quantum drive is capable of speeds of 10 light-years per hour. Isaac calculated that the shuttle had been thrown approximately 1000 light-years from its previous position. Therefore, the Orville should have been able to reach them in about 100 hours, even traveling by normal space, which is just over 4 days. Still probably too late to save Ty from succumbing to his infection, but not the "weeks" Isaac quoted. An android should get these details right.
When the cannibals are attacking, the view from the second shuttle shows 37 life forms plus the 4 crew members. Bortus mentions there are two dozen unidentified life forms approaching. He is shown to be a strictly literal character that would not grossly underestimate a threat.