Being Quarian Required to Be Quarian Ark's Pathfinder

I think it'd make the most sense for the Pathfinder to be drell. The elcor are durable but slow. The volus could die from suit eruptions. The hanar require use of gear to move on land. The quarians would be vulnerable to suit exposure even on a world where the atmosphere is not hostile like Habitat 7's.

Out of the races onboard, I think the drell would be most suitable for the Pathfinder role. They are able to move quick and they wouldn't be as vulnerable to any suit breaches or equipment failure the same way that the other races would. Additionally, drell have eidetic memory and so are able to recall events even if they've only seen them briefly.